Q: how do i stop spinning beach ball in safari in el capitan

For starters please post an Etrecheck report: http://etrecheck.com

The issue in Safari may be a matter of extensions. If you can force-quit Safari and

then restart it without them active, it may help to troubleshoot the browser...

• If Safari is slow, stops responding, quits unexpectedly, or has other issues - Apple Support

• Apps can affect Mac performance, battery runtime, temperature, and fan activity - Apple Support

Since Safari is not my first browser of choice, I've not had to start it without extensions

so I'm not sure if you start Safari with the shift key held, or use another....

This is where they say you can start Safari with the Shift key held; and other reasons why:

• Stop pop-up ads in Safari - Apple Support

After all this you could download the report generating app from Etrecheck if you like;

it can be helpful to reveal bits that may be causing issues. It can also be used to remove

some kinds of adware. Read the instructions before downloading this item.

Good luck & happy computing...!