Pi Camera Lag raspi 3b

hi to all, i have an issue on the raspi cam,

i see the streaming in 640x480 and no have problem but the aspect ratio is 4:3.

i set the resolution on octopi.txt 1296x730 (pi camera 1.3) and i have lag 5-6 sec, incrase the gpu ram to 512 but no resovle it.