Why is my email taking 3-5 minutes to view a email

First, please do a Safe Mode restart and then restart normally and test. For instructions please click Safe Mode. If that does not help the next logical step is explained below.

It will help us get a good idea of what is causing your problem if you provide a report of your system, that way we do not have to play 20 questions with you. The report we are requesting does NOT provide any personal information and is extremely safe to use. Please navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.

When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again. 

For instructions on how to download your EtreCheck report and attach it to your reply to this message please click How to use the Add Text Feature When Post… - Apple Community

You mean when you receive an email or send? or when you open an email and this takes 3-5 minutes? Either way, check the emails for large attachments from known source and perhaps connectivity / latency issues. Sometimes servers in your region may be the issue. Just for clarity, is it email or gmail?

I suspect the problem you are experiencing is due to installing piriform ccleaner please locate the developers uninstall instructions and then uninstall the app. After you have uninstalled please restart in Safe Mode per Safe Mode and then restart normally. Then run another EtreCheck report and look carefully if there are ANY parts of piriform cleaner installed on the computer.

Okay, there may still be pieces of that app left behind. Download the free version of FindAnyFile and have it look for anything that contains "piriform" and also "cleaner" and move to the Trash, then empty the Trash. Do another Safe Mode start and restart normally and test again.

Well it looks like you are going to have to give AppleCare a phone call and likely will have to take the computer in for service.

AppleCare Contact Info

Good luck.

Please re-read the instructions again. They work, you are simply making a goof somewhere along the line.