Much depends on the fingering one chooses.
koji (STSD)
How explicit..
I've just begun to conquer Chopin's etude in thirds after much constant practice, of course using Chopin's fingering written in the edition. Refer to this pdf that I bootlegged from somewhere else on the forum a while ago:
www24.brinkster.com/wwwdot/various%20chromatic%20thirds%20fingerings.pdf
When practicing slow, make sure that you are not raising your fingers high into the air, as this loses time and makes more effort than necessary. Do the bare miniumum to get the next finger over the next key and keep the fingers relatively low - the shortest distance between two keys is a straight line. Legato is the next hardest obstacle and probably the most important. When going from E-G to F-G#, the thumb will be jumping, so this must slide to the next key for best legato (though it's pretty tough). But the important thing in this transition is the upper line, where the melody is, going from 4 to 2 from G to G#. This must be smooth and well help to cover up any marcato you may have with the thumb transition.
Btw, you should probably do some pre-thread research on the forum .. chances are, your topic has already been discussed (and discussed, and discussed).
https://www.pianoforum.net/cgi-bin/yabb/YaBB.cgi?board=repo;action=display;num=1058843379;start=28