How do you know that?
Do you have links to similar bug reports or something?
What do you mean by that?
Webpages load slowly in your browser?
Packages are slow to download/install/update?
Have you used any tools to measure the performance or to find any errors?
To begin it probably makes sense to include system information.
Something like
inxi -Farz
The following guide may also be helpful, including how to format code, etc.