Experiencing Lag

[JMarquis]

Hello there. I'm the one whos experiencing lag in game? The Character is in Valdrakken and I cannot even mount up on drake. 
Maybe I need to clear some game cache? It's not something i've made in last few years, someone can point me up to the folder i need to clear?

 

Thanks

[JMarquis]

After the server restart happened right now, everything seems be back to normal.

[traktician]

Lag , server down 3-4 times per 24h.They really need to invest more into this expansion cuz its gonna be the most played.