you are the big stack, and you are the only one that can bust him. also, the other two players have less than 10 bbs.

the fact that your image is laggy doesn't matter as much, because he will still probably be cautious with you given the stacks.

preflop is fine. lead out strong on the flop. if he raises or calls, then reevaluate.

after you checked the flop, checkraising all in against his small bet is a risky but badass play. he's going to lay down a lot of hands, and there are very few hands against which you aren't drawing live if he calls.