hoaxed

I am using a 400mbps internet speed but my download speed in Arma Reforger is still very slow. the server I am joining only has about 2.9gb of mods to download but its taking forever for me to join and to download all the files. all my friends doesnt seem to have any issue and were on the internet provider so I don't think that is the issue. if anyone know how to fix this, please help. it is very irritating.