Minecraft 1.7.10 Has Been Lagged Problem (HELP)

I Just Downloaded Mods With Some File Jar And Trlaunched Have Installed My Minecraft Verison 1.7.10

Looking Done With Some Not Supported With 1.17 Come Out And Until Mincon Live

We Can't Delete Jar File Mods From Minecraft? Why Is Started Released 1.17 Verison With 2021? Please Help Me