There is opened thread on KoreanRandom with similar problem, so we will see if XVM team can do something with FPS loss. I've tested XVM yesterday and got same behavior (FPS drops after some time of gameplay) with different XVM configuration (from Aslains).
It comes from Spotted vehicle direction on aim circle
I forgot to copy .dds (background) and it's it's placeholder.
You can try to disable it by editing: res_mods\0.9.17.0.1\scripts\client\gui\mods\mod_spot_indicator.json
Change true to false
"enable_panel": true,
Have't figured it yet, it's a new feature.
Pochodzi z moda Kierunek do wyspotowanego pojazdu na celowniku
Autor Krzysztof_Ch... dodal nowe pliki ale nie raczyl o tym poinformowac i wszystko rzucil do wora z innymi modami. Dzisiaj wyciagne z niego brakujace pliki. Po prostu brakuje tla pod tym znacznikiem odleglosci, i pojawia sie czerwony zamiennik.
Thanks for the release of new Mods each time WOWS updates something. Just a fun game for my son and I to play - the mods assist, clarify, simplify and highlight as required, great service, thank you