Script execution has been terminated: Unknown system error
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I've gotten this twice since the upgrade yesterday.
I've reported this previously on the PTR forum - http://screeps.com/forum/topic/131/PTR-Script-execution-has-been-terminated-Unknown-system-error
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i got several of those too.
plus the cpu usage seem to be varying more than before, on the graph below, the yellow line represents how often my code aborts processing early because used cpu reached 450. The green line is for ticks where memory was not saved (expect to be hard resets)
There's definitely a trend I think
average used cpu after the change was probably about 5 cpu higher than before (because my code was not ready for the terminal cooldown, and this consumed more cpu), but i don't think it explains what i'm seeing here 
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You may just be on a bad node at the moment, as my performance has significantly improved with this update.
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general performance seem to have increased (although this can be caused by the fact that when my throttling kicks in, cpu usage isn't updated) but i seem to be gettign unusually high number of ticks where used cpu goes over 450.
before the upgrade throttling kicked less than 10 ticks per 90 min, now it's more 40 or 50 (and the trend doesn't seem to change for now)