Performance Display Values

Hi everyone,

About two weeks ago I noticed in the performance display that my IN value started peaking around 60-80 at the beginning of the match, and then drops to 15-20 at the end. It slowly drops as more and more teams are eliminated. The OUT value, however, stays solid around 4-8. My latency does the same sort of thing, starts high around 70-90 (even though I'm connected to the closest possible server location) but then declines as teams are eliminated. Both of these cause stuttering and lagging at the beginning of the match, and then it slowly goes away. The weird thing is that when I'm in the drop ship these values are ok, but as more teams drop, and then I drop and get to the ground it rapidly increases and peaks.

So I have a few questions:

1. What exactly do the IN/OUT values mean? Are they related to my ISP or is it solely on the Respawn/EA server side?

2. Do those IN and OUT values have a major impact on stuttering or lag? Or is that only a latency/packet loss thing?

3. Why does it seems to be related to the other players in the game?

Specs:

Playing on PS4, wired connection, modem on bridge mode plugged into 3rd party router, all ports forwarded properly (unless I missed some).

Tried factory resetting the modem, router, uninstalling Apex, DMZ-ing my PS4, using VPN, manual DNS entry... nothing seems to take care of this.

Thanks :D