I am experiencing slow Safari browser loading and crashing of my internet. I my OS is 10.13.3. This is on my iMac 27 in. All my other devices are fine except when I have my iMac on the internet. It brings all my internet enabled devices to a halt.
I am on an iMac with OS High Sierra 10.13.3
When I am using Safari my connection speed is very slow or crashes after a couple minutes.
On shut down of my computer if my email is open it will cause the shut down to stall. I can over ride it by force quitting my apple mail program. The computer will then shut down.
I have dumped my cache in my Safari browser. Eliminated old links that are no longer needed. I have gone into preferences for Safari and have turned off Safari recommend