lack of bandwidth?

we are feeding each tower with a 3 meg DSL line - using 900 mhz canopy equipment. at one location we’re coming out with a 2.4 backhaul and going into a 5.7 ghz omni into a 5.7 ghz SM - into a 900 mhz AP. At this location the speed has recently dropped to 800 k, as opposed to the 2 meg or so they were previously getting. The only thing that has changed is we have changed out a regular dumb switch for a managed switch and turned on broadcast storm control.

Would this affect our speed at this tower or is there something else i should checK?

thanks in advance.