Take this with a grain of salt as im not a dev or pro but ive noticed...
Weather and ime of day are factors...try to keep it before 7am and when weather in surounding cities is pretty calm
Length of tethering is a factor such as phone getting too
Hot and custom cpu settings . Try to do it fast.. know your download links
And proceed without distraction
These are surface non technical observations but might help your expectations
Thankfully i barely need to tether as yhe triumphs screensize has me barely
Using my computers. Im even able to psy my bills faster on my phone. Tethering
can be so useful sometimes im so glad the devs made it possibl for when its mich more expedient