I play with the G Wireless Bluetooth at 800 DPI. A buddy on 600. I know someone who plays Fortnite at over 1000 DPI How can you play that high?

PS: I can only play shooters etc. On 800 DPI. Colleague plays on 600 DPI, I can do it nicely… And how can you play Fortnite above 1000 DPI?

The DPI only designate the sampling rate (= precision) of the mouse. Are you mistaking this for mouse speed?

No. Because 600 DPI is slower than 800! And how can you play with it?

You're definitely mistaking this for mouse speed. Obviously, if you increase the precision, you will have to adjust the mouse speed.

Look here