Frequently when I'm trying to play Omen Raiders, the game lags up, including not firing when I'm holding the space bar, not moving when I tell it to, or sliding me halfway across the screen. Does anyone know what I can do to avoid this?

Maybe try using a different browser or updating your browser. It could also be from having a lot of tabs open. Maybe open a help ticket and ask, that could help.

Try clear your cache/history? Also, close tabs/programs like above suggested, helps a lot.