Most of the users complain about overall platform slowness, Here are few steps to evaluate if the slowness is at ServiceNow or with the network or browser.
1)For the users who are reporting slowness - at the end of form/list you have a response time indicator which shows
Response time(SQL time + BR Time + ACL Time + Total Wait time) Network time and browser time.
2)If the response time is high there is some piece of code which is taking time and that you identify from the transaction logs.KB - https://hi.service-now.com/kb_view.do?sysparm_article=KB0584420
3)You may select Created by as the user who is facing slowness and sort by the response time to check slow running transactions,
4)If the total wait time is high, which is session wait time + semaphore wait time
If a user were to open 3 tabs at the same time with each one displaying a list/homepage/dashboard etc, the browser tabs will load the data on each tab one at a time. This is session synchronisation in play.
You may refer to KB - https://hi.service-now.com/kb_view.do?sysparm_article=KB0755706
5)You can also check the ServiceNow performance dashboard and system diagnostics dashboard to check the overall health of the instance.
