[Resolved] Random undetectable lagspikes – Onlime ISP issue

Bug report reference number – 304 402 352 (https://i.imgur.com/r3nCYFP.png).

This didn't happen earlier. Game freezes for couple of seconds, then speeds up (feels like it tries to get in sync with smth).
I'm pretty sure I did nothing to PC setup (only Windows updates are on). I even didn't update my graphics driver for quite a while.
I've asked about lagspikes one person while trading and another one while partying and both of them confirmed that they are happening.

What I did trying to fix it:
Upgrading video drivers to latest version.
Disabling Windows Defender (the only AV software).
Checking defrag status and while it was only 2% fragmentation defrag game directory anyway.

OS: Windows 10.
CPU: Intel i7 3770k
GPU: Radeon RX 480
RAM: 14 GB (8.6 GB free without PoE)

PackCheck.exe –
Some realms pings on moment of lagspike – https://i.imgur.com/2MrCtPe.png
Some realms pings on moment of lagspike – https://i.imgur.com/waTeOby.png
Defragmentation status – https://i.imgur.com/39ahdkM.png

Auto graphics engine settings (Dx9Ex):
Screenshot while lagspike is happening –
Screenshot right after lagspike –

Dx11 Beta:
Settings screen –
Screenshot while lagspike is happening –
Screenshot right after lagspike –
AMD WattMan –

Dx11 Beta with all setting put on minimal:
Settings screen – https://i.imgur.com/25r37VB.jpg
Screenshot while lagspike is happening – https://i.imgur.com/GVLoZPg.png
Screenshot right after lagspike – https://i.imgur.com/8X4B6ZY.png
AMD WattMan (it seems, with minimal settings it even drops memory clock to 2D values while lagspike) – https://i.imgur.com/eQ6GUrm.png

Using VPN to Netherlands, playing via Amsterdam gateway, same thing all along (2 302 890 996).


Another one (2 841 548 348) – https://i.imgur.com/yXZdqyG.png
Another one (4 277 017 404) – https://i.imgur.com/OSWODMo.png

Happens in town too (3 205 972 238) – https://i.imgur.com/pf0sXrq.png

Seems to be resolved as ISP issue. Moscow, Onlime.