I see the same 90Mb/s as you, so I suspect they are capping at 90Mb/s. For another test, try fast.com and click "more info" after the download stops.

I have fios 1Gb service. From clouldflare I see ~500Mb/s down and 90Mb/s up, and fast.com shows 600Mb/s down and 900Mb/s up.