High CPU usage on pipelines table when hovering over CI status icons

Reproduce here: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10718/pipelines

I've seen CPU usage up to 100% here, and @blackst0ne confirmed he saw up to about 85%. Either way, the lag is noticeable.

It seems to only occur for MRs with many pipelines.

Chrome profiler confirms lots of time spent repainting:

I want to say this is a regression because I've never run into this behavior before, but then again I don't see a lot of MRs with 100+ pipelines.

cc: @filipa

changed the description

Not sure if it's only the pipelines tab or the fact that MR has 200+ discussion items, but yes we do need to paginate this table and there is already an open issue for it, but I can't find it. :(

@grzesiek do you know the issue number?

It is not a regression :)

@filipa I can't find it either. Should we open a new issue in that case?

Found it https://gitlab.com/gitlab-org/gitlab-ce/issues/28249!

Closing in favor of https://gitlab.com/gitlab-org/gitlab-ce/issues/28249

closed