If it is not on the laptop and the Internet according to the router software runs smoothly and in the radio channel are no other devices? The router itself? How can you find out? Fritz box 7360, 100K DSL line
How do you know it's not on the laptop? Is the ping on your phone just as bad?
Open the settings of the router, click on "Internet" and then "Online Monitor".
What is displayed with "downstream" and "upstream"?
The diagram is empty, otherwise 108 Mbit / s in the downstream and 44.5 Mbit / s in the upstream.
And what exactly are your problems with the ping? Or should we guess?
Is it a problem at all? Or is it just a problem for you (ie a conceited problem)?
How high is the ping?
The "ping" is a value that reflects the delay with which you may be able to answer a potentially far-removed, possibly heavily overloaded hardware. So in many cases it is not in your own hands to be able to change something.
By that I mean an unstable ping that always happens to skyrocket, even if no other devices are active
Usually from 30 to over 200, also gladly several times per minute.