Just an FYI (maybe)
I usually use Chrome as my browser. I was using it for S7, and found interacting with the Taxon tree (especially scrolling) very laggy (VERY laggy). Today, I was playing around using different browsers to be logged into different collections and found the S7 Taxon tree much much (very significantly) more responsive when in Microsoft Edge.
Obviously, could be my own settings, and that I am often on VPN, but thought I would share my experience here. I did a quick search, but didn’t find anywhere indicating if S7 had a ‘recommended’ or preferred browser.
Never thought I would ‘choose’ MEdge, but it makes the tree so zippy, I won’t be able to stay away 
cheers!