Roll20 is running slow when entered as GM

Seems like some issues are arising from the GM logins. When logged in as GM, things take much longer to load. Also, performance issues (such as moving tokens, editing a single field in a character sheet, or even editing tokens) tends to take longer than it used to. The current game/session has a great deal of journal entries (character sheets/handouts/etc), & there MAY be issues with the GM computer capabilities. Thanks for any advice & suggestions. 

Some suggestions: use old lighting system. disable advanced fog of war if you are using dynamic vision. untick the vision option on lots of the NPC tokens.

Thanks for the advice. I will give it a try & pass the info along. 

Upon conferring with with one of my fellow GMs, it seems he's using the old lighting & none of his NPCs had vision. Still waiting on word in regards to the advanced fog. Again, thanks for the suggestions.