Is this normal even when my device is closest to the router? When I put my cell phone even on the router, I still get the same speed.

Sometimes the ping in my local network goes up sharply (around 1000) What's the problem? How can I solve this problem?

On the box of the router, the speed of 2.4 frequency is written as 300 Mbps, but when I take the speed test, the speed of 150 Mbps is shown, even if I am very close to the router, what could be the...