How to fix Lag in game

Type /p and /fps commands in-game and let me know what values you got.

Does the chat appears instantly for you? The delay you've got it's huge and not normal.
This could be due to multiple reasons like: usage of torrents (uploading/downloading eats a lot of bandwidth), your isp might be performing a maintenance over the external bandwidth, spyware/malware/virus infection.

Your location shouldn't be an issue either as we have players from all over the world and Croatia has a fast reliable connection to our european hosted server.

 

Just because you played online games few days ago it doesn't mean you are not having connection problems right now.

An average of ~100 ping is definetly not a cause for your delay. You could wait for tomorrow and see if this still happens as it might be indeed an issue from your ISP. You can also test some other online games you play but make sure they are hosted outside of Croatia because it might be an external connection problem as I said. If your other online games are fine and you still experience this delay I recommend reinstalling the game although I'm sure that the internet connection is to blame considering the big latency spikes you have.

 

Glad to see you found the cause of your problem.

That explains the huge delay you had as most of times it's related to the connection itself (being the network card, router or internet service provider) and since the wireless card was causing the issue you might expect for it to crash soon. If your wireless card warranty is still active then I recommend you replace it as it's free of charge.