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Amateur numbers... I've tested over 10000 (not right now)... It used to get really slow after 9000, but things seem to have improved.

Were all tabs loaded though? If one tab takes 10 Mb of RAM (very low estimate; many take 50-100 Mb, especially Youtube), then 10K tabs require 100Gb.

I’ve started seeing tabs that weigh in at multiple gbs. Cloud provider consoles are particularly egregious examples here.