Free up RAM/computer running slow

2010 iMac can have max 16Gb memory, AND - the memory slots are user accessible. (likely, you have 2 slots free)

https://support.apple.com/en-us/HT205040

4G memory is barely can run nowadays softwares, especially memory hog Google.

Try to get memory from reputable vendors, such as Crucial and OWC.

Macs are very selective in terms of memory modules.

Please do NOT try to use "so call" "cleaner" softwares alike to temper your system

The best way to get accurate help, is to post your EtreCheck Report.

From your current description,

1. One option, would be to dump Chrome and use Safari.
2. The second option, would be to upgrade the Memory in your 2010 iMac to 8GB or 16GB.

see > https://eshop.macsales.com/shop/memory/iMac/2010/DDR3_21.5_27

I agree with the recommendations made here. You definitely need to install more RAM. Also. it helps to periodically restart your computer and to empty your browser's history since it is stored in RAM. Last, do not leave a lot of apps open if you are not using them. Good luck.

As others have been told to do I ran EtreCheckPro to find out what is wrong with my computer.

Wel, EtreCheck reports are intended to be posted here so others can help. It will not reveal any personal or security information.Please post the report here, using these guidelines:

Run it, select “Report" from the left-hand pane (scroll down to the bottom of that pane to find):

When its report displays, click the "Share Report" icon from EtreCheck’s toolbar and then "Copy report” from the resulting dropdown.

NOTE ⚠️ Please DO NOT highlight the text in the report before using Etrecheck’s “Copy report” command—that will garble the formatting and make the report slower and harder to evaluate.

NOTE: Changes in late 2018 to the forum software require you use the “Additional Text" icon (see example below) to embed the report into a post:

Paste the report into the resulting “Additional Text” window:

A posted EtreCheck report often leads to a very fast solution to problems.