Sluggish when 2 windows open - Ubuntu 16.04


On Kubuntu 16.04. I have about 15 tabs open in the first window. With a second window open and minimized, with about 5 tabs open, the first window becomes sluggish. Switching between tabs can take several seconds. After closing the second window, response is back to normal.

          total        used        free      shared  buff/cache   available

Mem: 20550988 10877480 618472 1689172 9055036 7516452
Swap: 0 0 0

Brave 0.22.727
V8 6.6.346.32
rev 2c94bba
Muon 6.0.12
OS Release 4.4.0-127-generic
Update Channel Release
OS Architecture x64
OS Platform Linux
Node.js 7.9.0
Brave Sync v1.4.2
libchromiumcontent 66.0.3359.170


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