Just open task manager ctrl+alt+esc and minimize the game ....
Wait for 2 , 4 minutes then maximize the game .....
This solved my problem

@Biggdogg i have tried that for my lalptop dell e4310 4gb ram , 2.67 4cpu procesr , but did'nt fix the lag ...
Will it lag on hp e8400 4gb ram & 2.66 2cpu s , and 1gb quadro 600 nvidia

Hello all dear friends i need help for gta 5 , i have hp q8400 quar2 quad , 4gb of ram ,2.66ghz processor 2 c.p.u and 1gb quadro 600 i am getting lags on gta 5 and can't effort any upgrade for my pc .....please help my first question in gta5mods