It appears that in EVO that when a screen loads there is a delay before it is ready to take input.  For  example, In EVO load up SO-A (in my case, it lists the open Sales Order. If you try to click on a SO before the top entry is highlighted, you get an Access Violation.  This one is recoverable.  If the program ignored input until it was ready, this would not happen.
There may also be an issue when you have made an entry such as a SO line item and then move too quickly to input something else.
Maybe EVO (TAS?) doesn't buffer well or it may not be possible to program in short "pauses" where you can't click/input until it's ready.

In cases like SO-A where there is an OPENING LIST (IN-A,IN-B, SO-A, PO-A, AR-A, AP-A, WO-A) and they are set to open that way US-A to set them on or off (enable opening list) It has always been an issue if you click somewhere else while it is trying to load it loses focus and causes an AV or Stack error. That is why I added notification sounds to Grids yeas ago. In US-A on the misc tab, second question is Enable Notification Sounds. If you check that ON  then as the grids load, when it is ready for user input it plays a chime. Until you hear that chime the system is still loading data. I know it is not the optimal solution, and to have all user input disabled until it is ready would be, but I cannot seem to find any way to accomplish this in the current language Evo is written in. Now the speed at which those programs do load does fully depend on how much data you have.. if for instance you run SO-A in the 99 Test company with very little data the lists are instant. but if you have years of data in your sales order files and have never archived them, it has to go through years of data to show you the open sales orders. I would suggest archiving all closed SO,PO,WO to start and turn on the Sound notifications just to let the users know when it is good to go..

Archive SO,PO,WO are located on SM-J menu *note this is Archive not Purge you can still see and access archived files.