Auto Call Log does not pop or is very slow on NetSuite when enabled.

Raise a support request with NetSuite for resolution. NetSuite's concurrency limits let you allocate a part of your account's concurrent request limits to specific integrations. An account has limitations to the number of times requests can be made to the web services and RESTlet. For more information, read Concurrency Limit per Integration.

This issue is due to NetSuite's Concurrency Limit. Only one request may be made against a session at a time.