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Cannot create or edit Apex classes/triggers due to browser time-out

Knowledge Article Number 000213747
Description Attempts to create or edit apex classes/triggers fail due to browser time-out When a user tries to create or edit an apex class/trigger, the system behind the scene attempts to compile related apex classes/triggers. If the org has a large number of apex classes/triggers that are not marked IsValid, the compilation process can time out. 
Resolution The recommended approach is to compile all classes first (and wait for all apex classes to show IsValid=true) before attempting to create or edit apex class/trigger.

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