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Dropped Frames and Lag time

If this template helps then use it. If not then just delete and start from scratch.

OS (e.g. Win10):
PsychoPy version (e.g. 1.84.x):
Standard Standalone? (y/n) If not then what?:
What are you trying to achieve?:
I want to know the exact time stimuli is presented and on the screen. Each item is supposed to be shown for 750 ms though sometimes there are lags. Do you guys have any ideas as to how I can know the actual time that each stimuli is on the screen?
What did you try to make it work?:
I tried to code to record this and the image below showed up.
What specifically went wrong when you tried that?:


Include pasted full error message if possible. “That didn’t work” is not enough information.