Collabora Online performance wins – an insight into our ongoing work

Optimizing the performance of Collabora Online is one of the central focal points within our current development work. Following improvements in the recent Collabora Online 6.4.10 release, the upcoming 21.11 release will exhibit more of the continuous improvements in this area. The improvements may be noticeably experienced through a variety of daily work done by means of the software. But how exactly does the implementation of massive performance improvements work? It can be compared to solid detective work. Follow us through this search for clues!

Performance improvement for multiple users – a detective story 🔎

In advance of the actual coding, working on performance improvements closely resembles detective work. Simulating multiple users working on the same document, is something that turned out to be feasible with the feature in LibreOffice purposed for displaying a document within different windows (Window > New Window). This was a feature that already existed in LibreOffice predecessor OpenOffice. It may be a rarely used feature on the desktop, but it does mirror the way of collaborative editing with Collabora Online. However, one must then find out how this code scales… The investigator in this story is Collabora developer Luboš Luňák. He was on to something big here, which led to significant performance improvements across various levels, ultimately benefiting all users of LibreOffice Technology. The technical details of his search and subsequent conclusions can be seen on Luboš’ blog.



Performance wins illustrated 📊

While extensive work continues with its progress, a list of current performance improvements is also available on Luboš Luňák’s blog. The following video of the Collabora Online perf-test – a test routine we use to measure performance in Collabora Online – illustrates the performance improvements of the implementations already made. The test simulates the fast, simultaneous typing of six users in a document (the other five are not visible in the video because they are writing elsewhere in the document). The rigorous test setting, which goes far beyond what is required of the software in everyday use, is ideally suited to visualizing performance improvements. In the video, you can see the performance of Collabora Online before the latest optimizations in the upper excerpt, and the significantly better performance in current versions during (middle) and after optimizations have been implemented (bottom).

Optimizing pathological loads – before/during/after


Performance talk at COOL Days 2021 🆒

Collabora developer Luboš Luňák discussed the various performance improvements in Collabora Online during the Developer Day at COOL Days 2021, a conference hosted by Collabora and dedicated entirely to Collabora Online. His talk “Rendering wastage and performance wins” covered the profiling process, described existing performance issues and displayed a variety of improvements at different levels. Technically interested people can find his talk on YouTube. The corresponding slides are also available for download.

Watch the video!
Download the slides!



Please try out Collabora Online 21.11 – RC 1, and let us know of any workloads which you find have issues so that we may expand our internal testing & benchmarking to include them.

About Collabora Online

Collabora Online is the powerful LibreOffice-based online office that supports all major documents, spreadsheets and presentation file formats, which can all be easily integrated in many infrastructures and solutions. Key features are collaborative editing and excellent office file formatting support. Collabora Online is excellent for enterprises that need a powerful office suite in the Cloud, or on-premises, that protects their privacy and allows them to keep full control of their sensitive corporate data. Collabora Online – built on LibreOffice Technology – enables Hosting and Cloud businesses to include document viewing and collaborative editing functionality into their service offerings.



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Collabora presenting the 2021 LibreOffice & Online growth infographic

In the aftermath of this year’s LibreOffice conference, we are glad to provide you with the latest update of our LibreOffice growth infoGraphic, including beautiful visuals and interesting numbers! We do hope you appreciate it and would love to hear your feedback. And of course, it is great if you find the format, in which it is presented, convenient to share.

Despite the challenges posed by the global pandemic in general, the statistics around LibreOffice collaboration are impressive. Although the total number of contributions to the LibreOffice core has slightly dropped compared to the year before, our developers remain top code contributors to LibreOffice with 4188 code commits (32.3%). The popular Collabora Online Development Edition (CODE), for home use & small teams, saw over 70 million Docker image pulls! We are glad to acknowledge, that the move of Collabora Online to GitHub has resulted in an increased number of contributions from the community. We are truly grateful to the growing number of partners, customers and volunteers for making this work possible.

The number of worldwide Collabora Online partners has raised to 230, the Collabora Office app for Android, iOS and Chrome OS saw 500,000 installations and the last year’s joint online conference by LibreOffice and SUSE did welcome over 130 participants from all over the world.

Would you like to see some previous versions of the info graph? Please find them here: 2020, 2019, 2018, 2017 & 2016.

So, without further ado, please have a look at the updated LibreOffice growth infoGraphic on 2021 here:


Try Collabora Office and Collabora Online!

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Talks and Slides by Collabora at the LibreOffice Conference 2021

Watch the talks and download the slides of Collabora’s contributions to LibOCon 2021

The LibreOffice Conference 2021 (LibOCon) was held from September 23rd to 25th as an online event. Developers from Collabora have contributed a significant number of talks on various aspects of LibreOffice technology, like interoperability or performance improvements, and regarding Collabora Online and the ecosystem. Did you miss any of those? Don’t worry! The talks are available for you on YouTube. We also encourage you to download the slides of the presentations available in this overview.

Day 1: Thursday, September 23rd, 2021

Michael Meeks: Collabora Keynote

Michael Meeks, Managing Director of Collabora Productivity and member of the LibreOffice Board, looks at the latest developments around LibreOffice from an organizational and ecosystem perspective. See details

Watch the talk
Download the slides!

Noel Grandin: I feel the need… The need for speed…

Optimization is a lengthy process. But also an adventure that requires a bit of detective instinct and plenty of exploratory talent. Discover which adjustments are being made to make LibreOffice even faster and better performing. See details

Watch the talk
Download the slides!

Marco Cecchetti: Some improvements for the SVG export filter

Marco Cecchetti reports on progress around the use of SVG in presentations and the improvements in performance and storage requirements on export. See details

Watch the talk
Download the slides!

Tomaž Vajngerl: Improved document searching with LibreOffice

Collabora developer Miklos Vajna introduces the latest enhancements to LibreOffice and Collabora Online search that visualize hits across different documents. See details

Watch the talk
Download the slides!

Mike Kaganski: Multi-column support in LibreOffice 7.2

The new feature, its relevance, obstacles and implementation status. Mike Kaganski shares his experience, how interesting was it to work on this. See details

Watch the talk
Download the slides!

Day 2: Friday, September 24th, 2021

Cor Nouws: A year of COOL …

Find out about the improvements that LibreOffice technology in the browser experienced. Hear about success stories and new features in Collabora Online! See details

Watch the talk
Download the slides!

Michael Meeks COOL performance

Recently, we have been focusing our Collobora Online development on improving the feel and slickness of document editing. Come and hear about the things that we’ve found and fixed, both in COOL and also in the LibreOffice core to improve the experience! See details

Watch the talk!
Download the slides!

Sarper Akdemir: PPTX footer export & import interoperability

Sarper Akdemir outlines the challenges around the export & import of Footers in PPTX and how they have been mastered. See details

Watch the talk
Download the slides!

Miklos Vajna: Gutter margin in Writer page styles

LibreOffice was already capable of handling various margins in Writer page styles. A missing piece was the support for the gutter margins. Find out, how this was implemented! See details

Watch the talk
Download the slides!

Tomaž Vajngerl: Built-in “Xray” like UNO object inspector

When developing macros and extensions in LibreOffice, it is very useful to have an object inspector. The Document Foundation put up a tender to create a built-in Xray-like UNO object inspector. It was awarded to Collabora, and we are now in the process of implementing it. See details

Watch the talk
Download the slides!

Tomaž Vajngerl: PDF and other graphic improvements

The LibreOffice technology in Draw is key to PDF annotations, and the support of a recently added review-based workflow. Find out, how this has been implemented! See details

Watch the talk
Download the slides!

Day 3: Saturday, September 25th, 2021

Szymon Kłos: JSDialogs improvements over the past year

JSDialogs is a LibreOffice component used to share UI elements with Collabora Online. Hear about the most recent updates added. See details

Watch the talk
Download the slides!

Follow us for more insights on LibreOffice technology

Collabora Productivity created Collabora Online and is the driving force behind putting LibreOffice in the Cloud. Collabora provides a wide range of products, as well as consulting services for enterprises and governments. Powered by the largest team of certified LibreOffice engineers in the world, Collabora is a leading contributor to the LibreOffice Technology codebase and community. Collabora Office for Desktop and Collabora Online provide a business-hardened office suite with long-term support. Collabora’s multi-platform policy is completed with Collabora Office for iOS, Android, and Chrome OS. Collabora Productivity is a division of Collabora, the global software consultancy dedicated to providing the benefits Open Source to the commercial world, specializing in mobile, automotive and consumer electronics industries. For more information, follow us  on Twitter, LinkedIn and YouTube.



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A Business Perspective on Open Source – The Enterprise Open Source Day

Business perspectives on Open Source

Together with our friends and partners from Factor Group, Canonical, Nextcloud, Linbit, and OpenNebula, we will be highlighting business perspectives on the use of open source in the enterprise during Enterprise Open Source Day on 10 November 2021. The summit will feature talks from leading industry leaders such as Mark Shuttleworth, Frank Karlitschek and Michael Meeks. Details of the program are available on the event page.

Open Source in large organizations

Open Source is becoming more and more important for businesses building secure collaboration platforms. Over the last years, the various platforms have matured and are as capable, and often better than proprietary solutions, to offer the scale, security and integration large organizations need.

With our partners, we are pleased to invite everyone to participate in the Enterprise Open Source Summit, a virtual event focused on transition strategies and the subsequent successful use of open-source solutions in the corporate environment.

The summit will take place on November 10, co-organized between open-source industry leaders Canonical, Nextcloud, Collabora and Factor Group as well as Linbit and OpenNebula.


Each of us has years of experience with open source in finance, retail, energy, manufacturing, telecommunication, public sector and other areas. We will share our knowledge in a program of keynotes, lightning talks and demos, bringing several customers to talk about their experiences as well. Participants will be able to get answers to their questions first-hand from industry leaders.
The following questions and strategies will be discussed at the event:

  • Migration from deployed commercial products to open-source solutions
  • Commercial support for open-source solutions and related concerns (scaleability, stability, integration, vendor lock-in and more)
  • Security and creation of fault-tolerant solutions

Find a more complete overview of the program on this page.


Tickets for the Enterprise open-source Event are available at 150 USD. However, different early bird options are available, offering significant discount on the admission. Secure your seat at the event page.



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Developers Day: September 30th

COOL Days 2021 starts very soon with a Developers Day. Meet other developers at this event. It is free to join, virtual this year, and we expect the very first of many COOL Days to come! Reserve your seat by filling the form.

Developers Day features more than 40 sessions with included breaks for Q&A. All talks will be short, from 5 to 15 minutes, this in turn will allow you to watch more cool stuff and perhaps participate in Q&A slots! The full schedule will be released soon, but here is a test.

Starting off with the opening keynote at 09:30 CEST then a couple of talks ranging from insight on Localization of Collabora website; walk-through the Notebookbar structure; Updates on newly FreeBSD port; HowTo session on the Cypress tests and ending the morning session with Canvas for rendering UI.

Q&A ( max 15 min) followed by lunch break (1 hour), during the conference you will have multiple opportunities to participate during these Q&A time slots.

In the afternoon session, attendees will receive an update on the latest Calc canvas improvements followed by a presentation on Performance wins; Editing simulation; Android and iOS new features; Scaling improvements and Dialog improvements.

Q&A break (max 15 min)

See some of the Mobile design improvements; Get to know the ins and outs of bisecting; Collabora Online forum update; Learn how to get involved with translation; Stability and cleanup improvements; How 1&1 embeds COOL and right before the break Kubernetes setup & deployment.

Q&A break (max 15 min)

At 20:00 attendees will hear about all of the effort on the New sidebar and dialog backend. The proceeding talks will touch a variety of challenges and improvements: Async-save design; VBA macro support; OOXML document analysis; Rendering wasteage; Document searching; Multi-page PDF viewing; Text/JSON protocol performance improvement; Fuzzing / asan / string-vectors; User sentiment reporting; Setting up your own Collabora Online; SDK: creating a new integration.

Q&A break (max 15 min)

The last Collabora Online related talks centers on integration pieces and the latest development on that front. From the New Nextcloud/richdocuments pieces and New ownCloud integration pieces to the Moodle integration or the New Mattermost integration ending with a talk on how to contribute and the closing session.

The event as a whole is a great opportunity for people who are familiar with Open Source and Collabora Online. People who just want to learn more about the technology free of cost also have a great opportunity to experience the openness of COOL and the event itself.

Join us to celebrate the 1st COOL day on September the 30th, it’s free of charge:

Reserve your seat

If you have more of a business interest in deploying Collabora Online in the enterprise
then perhaps you should attend the Business Day? Early booking: 50% off before September 18!

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