Could be internet but are you using any kind of stats overlay like Rivatuner with MSI Afterburner?
It can cause stuttering issues for Apex and besure you don't have v-sync activated and please fill out
System Specs because I cannot see how much memory you got if it's single or dual channel plus are you running the game off an SSD?
Wire or not doesn't tell the whole story because you can still depending on the internet technology have problems that why I went back to fiber a couple of years ago from COAX because the latency on fiber is just better and your connecting is either on or off nothing really in between and if there is a issue it's one or two things the fiber box or your router that's used on fiber it's rarely a central problem.