Improve perceived performance of comment loading experience
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=356785) </details> <!--IssueSummary end--> ## Problem - MRs with tons of comments and activity take a long time to load and are overwhelming to read ## Potential solutions - [Expand middle of activity feed when it reaches a threshold](https://gitlab.com/gitlab-org/gitlab/-/issues/356785#note_2559730631) - [Pagination](https://gitlab.com/gitlab-org/gitlab/-/issues/356785#note_2559761868) - [Collapse similar activity](https://gitlab.com/gitlab-org/gitlab/-/issues/356785#note_2561473251) - [Add activity type filter](https://gitlab.com/gitlab-org/gitlab/-/issues/356785#note_2561479547) - [De-select less important activity items](https://gitlab.com/gitlab-org/gitlab/-/issues/356785#note_2562115913) - [Separating comments from activity log](https://gitlab.com/gitlab-org/gitlab/-/issues/356785#note_2578796549)
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