That's because it's new, rushed into release, poorly optimized, the netcode is iffy, nobody knows how to make a config for it yet, and they also removed a lot of the console commands/convars that made for good CSGO configs and performance.

High server load: If there are a lot of people playing on the server, it may not be able to process all the data. Server hardware issues: If server hardware is outdated or faulty, it can cause delays. Internet connection problems: If you have an unstable or slow Internet connection, this may cause an alert to appear.

cs2 actually uses your GPU now to do a lot of work unlike in csgo. so your framerates take a nose dive from csgo. but the benefit is now the game is not super cpu bound and with nvidia reflex and source 2being a much better engine.

Key differences between CS2 and CS:GO include: Game Engine: CS2 uses the Source 2 game engine, offering better visuals and effects. CS:GO used the original Source engine for over 11 years.