the trash fps, were they uneven or just 10 - 30 frames you can fix it by either letting chrome or whatever app you use to uncap frames
high ping, if youre playing in m8 its very very common because of the servers (in game servers that connect everyone) it could be the distance between you and the server host play in pubs and that should fix a lot of it or if its high ping in m8 go to 696969 usually theres less people an better ping
network, harder to fix cause thats usually your wifi/data thats causing the problem your router could be tweakin out too
^^ hope that helps (play n1 again frfr)