you're not hitting anywhere close to your max bandwidth with just 26 people at most it would be ~5Mb and thats with everyone using maxrate of 30000 which is nearly impossible, well maybe if it was a 13v13 firefight, with everyone throwing nades, explosions, barrels flying everywhere AND the bomb going off.
i'd run top and watch it when this happens to see what the load on the cpu is.
i'd run top and watch it when this happens to see what the load on the cpu is.