# 26.0 PHP extension sysvsem

**URL:** <https://help.nextcloud.com/t/26-0-php-extension-sysvsem/158819>\
**Category:** ℹ️ Support\
**Tags:** nc26\
**Created:** [March 28, 2023, 6:28am UTC](https://help.nextcloud.com/t/26-0-php-extension-sysvsem/158819 "2023-03-28T06:28:04Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![szaimen](https://help.nextcloud.com/user_avatar/help.nextcloud.com/szaimen/32/63019_2.png) [@szaimen](https://help.nextcloud.com/u/szaimen)\
**Post date:** [March 28, 2023, 8:12am UTC](https://help.nextcloud.com/t/26-0-php-extension-sysvsem/158819/5 "2023-03-28T08:12:33Z")

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It limits the amounts of previews getting generated at the same time. See [Limit number of concurrent preview generations by dbw9580 · Pull Request #18210 · nextcloud/server · GitHub](https://github.com/nextcloud/server/pull/18210)  
You can adjust the config with `preview_concurrency_all` and `preview_concurrency_new` if the defaults should be too low for your system.

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_[View the full topic](https://help.nextcloud.com/t/26-0-php-extension-sysvsem/158819)._