It's been used for years to tweak it up. However I don't dive into discussions about how the internet works much.
Try DrTCP. It's over at http://www.dslreports.com/drtcp along with other tools for tweaking and testing.
When I connect direclt to my modem with a laptop, my internet is excellent. When I connect to my router RV082, its another story.
In the router, the MTU was set to default. I would only get 1.52 download and 0.2 upload.
I tried MTU 1500, the download jumped to 4.85 and 0.54 upload. Which is excellent. But, I cannot go on hotmail.com, yahoo.com, etc, and emails wouldnt come in.
I tried MTU 1482, 1.71 download and 0.32 upload, and I was able to go on hotmail.com again.
Does anyone know the specific MTU for Bell Business line? This is driving our company insane