Tricks won't help here. I would not follow the advice of the above post. Trying to remedy an issue without first figuring out what it is can only complicate matters and likely make them worse.
Just a tip for you. Use of capitalization, proper grammar and spelling all speak volumes about a person posting. Just as the lack thereof does. You're posting on a tech help site on the internet here, not texting on your cell phone. A quick glance at your post screams "unprofessional" which in turn makes me, and other intelligent people, think you are clueless. If you want to be taken serious in the IT field, you need to write professionally.
Now, having said that........let's do some troubleshooting and see if we can't find out what went wrong before we try to fix it.
The first thing I would do is test to see if there's a difference between switches. I suspect you daisy-chained switch 2 into switch 1 which has the internet connection. Run some tests from clients on both switches. Is there a difference? Do clients on switch 1 get better bandwidth than clients on switch 2? If yes, I would suggest you buy a SOHO Router with 4 LAN ports and I would connect the internet to it and each switch to a LAN port on the router.
If there is no difference, then I would try unplugging switch 2 from switch 1 and test again. Does the bandwidth improve? If yes, I would do the same thing I said to do above (which by the way, you should do regardless)
If in that case the bandwidth doesn't improve, I would put a call in to your ISP's tech support line.
There could be many reasons why your bandwidth has degraded that have nothing to do with your setup, and/or equipment, and once you've ruled out your equipment, you then need to look outside your network. Don't forget, congestion on the internet itself can slow things down just as a server that is busy will respond slower than one that isn't and give the appearance of less bandwidth.
When testing, do so with multiple clients. Do not rely on bandwidth speed test sites. Do some data transfers. For testing purposes, I like to download service packs from microsoft.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.