Chopin etude 10/10 & forearm tension

[celticqt]

I can play it slowly with no problem, but as soon as I get up to tempo with the metronome, my right forearm tenses up like crazy and I can only get through about three lines of it.

I know there have probably been 10³⁴ threads written on this subject, and I searched for them, but didn't come up with anything right off.  Could someone recommend a thread that would help me with this, or possibly give me advice?

Thank you! 

[cloches_de_geneve]

I have the same problem with 25/9 -- I am at ease with 25/8, no tension whatsoever, and when I get to 25/9, which everybody thinks is an "easy" etude, after only a few bars I get this pretty advanced tension in right wrist and forearm. The result is lousy sound control. The only thing I can do after 15min is to stop practicing 25/9 and resort to 10/11 or 25/1 for relaxation.

Please help, as I would love to be able to make this little gem sound as it should!