running slow ran report

Welcome, and thanks for posting the WEtrecheck report. That is very helpful.

First, completely remove CleanMyMac from your system. It is fearware, nothing more. Your Mac can do everything CMM does on its own. CMM will only slow you computer.

Same with Dr Cleaner. Anything that claims to clean your Mac is uses a lot of resourcs for virtually no return.

It appears you have about 10 percent free space on your hard drive. With a minuscule amount of RAM installed, free space is important to maintain performance. It's time to off-load files you need to external storage and others to the trash.

You are breaking your computer's virtual back by running Chrome. Chrome is a resource hog that needs a lot of RAM, a modern processor, and free space on the hard drive. You have none of those.

You can add RAM at home. Your model supports up to 4GB RAM officially, and 6GB unofficially. I suspect that 4GB would be enough. As far as I know, the special 6GB kit is available from only one vendor, OWC. I cannot recommend making the jump to 6GB using any other vendor.

OWC's is quality stuff but the special 4GB chip that gets you to 6GB costs much more per GB than standard RAM modules. See:

Memory Upgrades for Apple iMac 2007 Core 2 Duo from OWC

and note the options table:

If cost is a consideration, I believe 4GB with El Capitan would give you all the "bang for your buck" that you need for the remaining life of the computer IF you stop using Chrome. If money is not a factor and you live someplace where OWC does business, go for 6GB.

Totally in full agreement with what Allan Jones has posted.

Maybe you can clear off things from your internal hard drive.

If you iMac is running low on storage, makes sure it isn't low because of it has a lot of data detritus on it.

Here are some general tips to keep your Mac's hard drive trim and slim as possible

You should never, EVER let a computer hard drive get completely full, EVER!

With Macs and OS X, you shouldn't let the hard drive get below 15 GBs or less of free data space.

If it does, it's time for some serious hard drive housecleaning.

Follow some of my tips for cleaning out, deleting and archiving data from your Mac's internal hard drive.

Have you emptied your Mac's Trash icon in the Dock?

If you still use iPhoto or Aperture, both have its own trash that needs to be emptied, also.

I don't use the new Photos App, so check to see if there is a trash icon or trash inside of the Photos App that you may need to empty.

If you store images in other locations other than iPhoto, then you will have to weed through these to determine what to archive and what to delete.

If you are an iMovie/ Final Cut user, both apps have their own individual Trash location that needs to be emptied, too!

If you use Apple Mail app, Apple Mail also has its own trash area that needs to be emptied, too!

Delete any old or no longer needed emails and/or archive to disc, flash drives or external hard drive, older emails you want to save.

Look through your other Mailboxes and other Mail categories to see If there is other mail you can archive and/or delete.

STAY AWAY FROM DELETING ANY FILES FROM OS X SYSTEM FOLDER!

Look through your Documents folder and delete any type of old useless type files like "Read Me" type files.

Again, archive to disc, flash drives, ext. hard drives or delete any old documents you no longer use or immediately need.

Look in your Applications folder, if you have applications you haven't used in a long time, if the app doesn't have a dedicated uninstaller, then you can simply drag it into the OS X Trash icon. IF the application has an uninstaller app, then use it to completely delete the app from your Mac.

To find other large files, download an app called Omni Disk Sweeper.

http://www.omnigroup.com/more

Also, Find Any File

http://apps.tempel.org/FindAnyFile/

If you are using OS X Time Machine for backups, make sure these backups are being stored to an externally connected hard drive for backing up data and NOT being stored on the iMac's internal hard drive.

Typically, iTunes and iPhoto/Photos app/Aperture libraries are the biggest users of HD space.

move these files/data off of your internal drive to the external hard drive and deleted off of the internal hard drive.

If you have any other large folders of personal data or projects, these should be archived or moved, also, to the optical discs, flash drives or external hard drive and then either archived to disc and/or deleted off your internal hard drive.

Moving iTunes library

http://support.apple.com/kb/HT1449

Moving iPhoto/Photos library

https://support.apple.com/en-us/HT201517

Moving iMovie projects folder

https://support.apple.com/en-us/HT203049

A disclaimer,

Things to consider before moving your iPhoto/Photos Library Folder to a new or external location like an external hard drive.

If you make movies on any iDevices using iMovie for iOS,, then transfer the video footage, the IOS version of iMovie saves the footage as a movie file in IPhoto/Photos for IOS and will automatically get transferred to iPhoto/Photos for the Mac when you upload the video from your iDevice.

Newer versions of iMovie will work and link those video files found in your iPhoto/Photos Library on your Mac, but those links can be lost if you move your iPhoto/Photos library and you will not be able to relink that video afterwards as the current versions of iMovie seem to not have a relink option for the video portion of the files (ironically, current versions of iMovie HAVE the ability to re-link the audio files from the video footage, though (The inability to re-link the video files could be a possible bug or oversight in current versions iMovie).

The lost video links show up as "blacked-out" video blocks with no content.

Before moving the iPhoto/Photos Library

If you make movies with iMovie using iPad or iPhone video then 'Consolidate' the files before you finish. This will gather (albeit by duplicating) all the relevant files in the project in one place. After consolidating/duplicating all of the audio and video footage to a seperate, independent location,it should be safe to move your iPhoto/Photos library.

The potential way to circumvent this issues maybe to try and import iPad and iPhoto/Photos video directly into iMovie which would be another solution.

Good Luck!