And improved the speed of my iMac

using autocad on my mac becomes very slow and it will increase the RAM to 8GB

I would put in as much RAM as you can afford.
8 GBs of RAM will probably just cut it, but your iMac can take up to 32 GBs of RAM.
I would up the memory in your iMac to, at least 12 GBs and if you can afford it, consider putting 16 GBs of RAM into your iMac.
I you are concern about your iMac's speed, make sure you do not have any other CPU, GPU and RAM intense applications running in the background, also.
Make sure your HD still has plenty of free space.
If you are getting low on HD space, this can slow things down.
You should have, at least 20 % or more space left on your HD.
IFbthe amount is less than this you need to consider archiving important data/files, deleting unwanted /unneeded files
or cloning your internal drive to a much larger external FW drive and clearing as much stuff off of your internal drive to make additional space on your HD.

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