Thanks for giving Need 4 Meat a try and apologies for any issues you're experiencing. The truth is that there is no downloadable build for N4M--it is meant to be played in browser. This is also the first we're hearing of any major performance issues. Have you tried checking the strength of your network connection? Additionally, have you tried playing the game on the itch.io app? From what we understand, the app allows you to install browser games. Might clear up any issues you are having.