Singleplayer long load and combat lag

Game mode: [Single player: (Online official | Online private | Single-player)]
Type of issue: [Enter one of the following: Crash | Bug | Performance | Misc]
Server type: [Enter one of the following: PvP | PvE-Conflict | PvE]
Region: [Please enter your server region]

I bought a new gaming pc and downloaded the game fresh yesterday. I only play singleplayer but this time, I tried to start a new singleplayer game and found that it freezes as soon as I try to join. Right before the character creation.
Today after waiting for 20 - 30 minutes, it finally loaded up character creation. When I got in game, I noticed that there was a huge lag in fighting.

How can I fix this? I used to play on a small laptop and had the game run there with no problems.

Please provide a step-by-step process of how the bug can be reproduced. The more details you provide us with the easier it will be for us to find and fix the bug:

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