I already opened this up in the students corner on moskowsky, and czerny.
Tempo in op25 nr 5 marked 184 per 1/4. Nr 4 is equally crazy.
I took gavrilovs performance (not to be accused of a slow player, i'd say on the contrary (see his goldberg variations)) and he clocks 144.
Also nr 4 he plays great at a much slower rithm.
I saw remarks on not to pay too much attention at it.
Ok, I do not, because i simply can't, and who can ?
The issue is, as a student learning on my own who has also himself as a guide and I like it that way, are these so called urtext editions correct historically, and if so, then I shut up, and first listen a performance and correct the urtext rithm myself. And I'll let short short or lang lang mess it up. If not, then it's a damned disgrace. Because utterly pedagogical dangerously misleading for autodidacts.
Lot's of success on keeping up with the metronome.