Chrome can't view jobs

Summary

In the past, I was able to view the JOB page without lag.

Since a recent update of Gitlab, I can't tell you exactly which one, then this page started to get super slow, I can say almost unusable except with patience and many refresh

Steps to reproduce

Start a long job on any projects and go to /jobs/$jobId

What is the current bug behavior?

Scrolling can be stuck, the whole page frozen, selection of text can take forever

What is the expected correct behavior?

I expect the job page to be fluid

Results of GitLab environment info

Expand for output related to GitLab environment info

root@git:/# gitlab-rake gitlab:env:info
System information
System:
Current User:	git
Using RVM:	no
Ruby Version:	2.6.3p62
Gem Version:	2.7.9
Bundler Version:1.17.3
Rake Version:	12.3.3
Redis Version:	3.2.12
Git Version:	2.22.2
Sidekiq Version:5.2.7
Go Version:	unknown
GitLab information
Version:	12.5.4
Revision:	63af04cacf5
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	10.9
URL:		https://git.kopaxgroup.com
HTTP Clone URL:	https://git.kopaxgroup.com/some-group/some-project.git
SSH Clone URL:	ssh://git@git.kopaxgroup.com:20022/some-group/some-project.git
Using LDAP:	yes
Using Omniauth:	yes
Omniauth Providers:
GitLab Shell
Version:	10.2.0
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

root@git:/# gitlab-rake gitlab:check SANITIZE=true
Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 10.2.0 ? ... OK (10.2.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Checking Reply by email ...
IMAP server credentials are correct? ... yes
Init.d configured correctly? ... skipped
MailRoom running? ... skipped
Checking Reply by email ... Finished
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... Server: ldapmain
LDAP authentication... Success
LDAP users with access to your GitLab server (only showing the first 100 results)
User output sanitized. Found 8 users of 100 limit.
Checking LDAP ... Finished
Checking GitLab App ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
3/1 ... yes
3/2 ... yes
3/4 ... yes
3/7 ... yes
3/8 ... yes
3/10 ... yes
3/23 ... yes
3/24 ... yes
3/25 ... yes
11/33 ... yes
12/34 ... yes
3/35 ... yes
3/47 ... yes
3/48 ... yes
3/54 ... yes
3/60 ... yes
3/63 ... yes
2/64 ... yes
3/65 ... yes
3/66 ... yes
3/67 ... yes
3/69 ... yes
18/71 ... yes
18/72 ... yes
3/73 ... yes
2/74 ... yes
3/75 ... yes
19/76 ... yes
21/78 ... yes
3/82 ... yes
24/83 ... yes
18/84 ... yes
16/85 ... yes
18/86 ... yes
25/87 ... yes
18/88 ... yes
3/89 ... yes
25/90 ... yes
25/91 ... yes
25/100 ... yes
25/101 ... yes
18/102 ... yes
17/105 ... yes
17/107 ... yes
17/108 ... yes
3/110 ... yes
27/111 ... yes
3/112 ... yes
25/114 ... yes
27/115 ... yes
27/116 ... yes
3/117 ... yes
29/118 ... yes
25/119 ... yes
25/120 ... yes
26/121 ... yes
27/122 ... yes
3/124 ... yes
2/125 ... yes
3/126 ... yes
3/127 ... yes
18/129 ... yes
3/132 ... yes
35/133 ... yes
31/134 ... yes
31/135 ... yes
31/136 ... yes
31/137 ... yes
3/138 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.3)
Git version >= 2.22.0 ? ... yes (2.22.2)
Git user has default SSH configuration? ... yes
Active users: ... 10
Is authorized keys file accessible? ... yes
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished

Possible fixes

I have no clue. I am using gitlab everyday and I saw this regression and tought at the time, that you will obviously fix it, after a few major release, it is not fixed so I am worrying a bit..