5 VDSL BONDING

Hey guys, So i have a RB2011UiAS-2HnD-IN and i have 5 VDSL each at 100mb Down / 4 Up

I should be getting 500mb download in a speed test and 20 up. I have tested each connection and the results were all good with 100down 4 up.

I have setup the mikrotik but when i do a speedtest i get 250 - 270mb down and around 12 up.

Im very new to the mikrotik world and it took me a dam long time to even setup, but i got there. When i do a speedtest and goes upto 100% cpu usage so im thinking maybe the RB2011UiAS-2HnD-IN is not enought cpu power to give me the 500mb full connection or im doing something wrong.

Is anyone able to help whatsoever because in turkey it costs a arm and a leg to even get someone to connect and give me a hand.