Use the just-released web app 3.87.2
https://app.plex.tv/desktop#
and monitor the behaviour.
Same behaviour. Lags on real time, no issues on 12hours
Edit: A restart of plexmediaserver seems to have fixed the issue for now. Will report if it gets worse again.
There is a related fix on the server side which will land in the next public version of Plex server.
The new version of Plex Web may be a fix for those that had the problem previously, but itās been transferred to my system where it all worked perfectly before.
Using Plex server Version 1.15.0.659 on a Windows 10 machine. Re-boot didnāt seem to make a difference.
What version of Plex Web?
The hosted version, 3.87.2.
The previous hosted version worked for me, but since the update a couple of days ago, I now have the problem with high ram usage and unresponsive on the dashboard page. The local version keeps chugging along just fine.
So as I said, the fix may have helped some, but hindered others
Iām not seeing that but iām running PMS Version 1.14.1.5488 with WEB Version 3.87.2
Its still doing it.
if you let the server run for too long the dashboard gets unresponsive. The only fix is to restart the server manually. I use the latest stable server version.
The fix is in 1.15, which is still beta.
Iām running server Version 1.15.1.710 on a windows 10 machine, and I donāt dare look at the dashboard on either the local web app or the hosted version. Unless the version 1.15 mentioned above is a newer version than the one I have, the fix isnāt quite there yet. In fact worse, because now neither web app works 
still happening on
server Version 1.15.1.791
web Version 3.91.0
Not working yet, in fact itās seems to be worse with the hosted web appā¦
Server Version: 1.15.2.793 (Windows)
Web Version 3.83.1 (local app)
Web Version 3.91.0 (hosted app)
maybe the real fix will be in version 1.16? 
I am also having this same issue.
Server Version: 1.15.3.835 (Windows)
Web Version 3.83.1 (local app)
Still happening on:
Server version: 1.15.3.876
Web version: 3.83.2
I have to restart plex media server every time it starts to lag and use GBs of ram
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