I'm on 52mbps fibre and, if connection based match making is still active, it is useless as all matches are full of laggy red bar game ruining pain in the arse immune teleporting arse hats!
Just look at these wall piercing bullets this guy has!
https://youtu.be/lR7kMA2kVV0
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It has always been a mix. It's just been a matter of how much sbmm is used. It has always been majority cbmm. This cbmm vs sbmm never existed and was a strawman argument. Sbmm component was toned down. Population has continued to drop and connection quality goes with it.