[SOLVED] about my lag

Aug 28, 2019
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so I had some problems with my monitor when I connected VGA in my computer nothing happened but now I use HDMI and everything its fine the problem is before I had this problem with the VGA the games were good i mean they didnt had LAG but now the lag its big and also my computer didnt had problems with the LAG
 
Can you tell me your pc specs and what monitor you are using, also what games?
well my processor: Processor Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz, 3601 Mhz, 4 Core(s), 8 Logical Processor(s)
memory : 16384MB RAM and
I don't know my graphic card
my monitor : its an asus monitor I bought it a year ago idk the name but I didn't had problems before