Slow internet speeds on iMac running 10.10.3

Hey folks,
Hoping you can help me!
I have a late 2012 21.5" iMac running 10.10.3 and currently I've been getting very slow internet.
I've done some troubleshooting:
I've taken it to the Genius Bar and the airport card is fine.
I've reset dhcp lease which used to work but now no longer does.
Currently, my internet only gets normal speeds (about 100 Mbps down) when I delete my system config folder. Even after deleting it, however, it's only fine for a short period of time (usually a few hours) before it goes back to crawling speeds (usually the speed test ping test fails).
It's definitely not the hardware of the machine because it's picking up the wifi, it's not the router because the speeds are fine on my other devices and fine when I delete the system config folder, so I know it's software related. The issue does persist in a guest user or known good account so I know it's not user repeated.
I wanted to see if anyone else has any ideas to resolve the issue in the OS' current state prior to me just doing an erase and install.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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**If someones post has helped you, please acknowledge their assistance by clicking the red thumbs up button to give them Kudos. If you are the original poster and any response gave you your answer, please mark the post that had the answer as the solution**
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Hi
After moving house it seems my imac does not want to download anything very fast. I have tried internet speed tests on speedtest.net on both my imac and my mac book. my macbook recorded 14.79 down and 1.25 up and on my imac the same test recorded 0.20 down and 1.05 up. Both computers are connected via WiFi and I am running version 10.6.8 on both computers. Can anyone help?

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I have a an old imac, still working and running on 10.5.8 !!
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NewerTech MAXPower 802.11n/g/b High-Performance Wireles USB Adapter w/bonus ext cradle. For Mac & PC
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Start up in safe mode and test. Any difference?
Start up in Recovery mode. From the OS X Utilities screen, select Get Help Online. A clean copy of Safari will launch. No plugins, such as Flash, will be available. Any difference?
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Slow internet speeds on iMac running 10.10.3

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