learning two mishnos in all the “wasted time”. (After you finished shemoneh esray and your’e waiting for the tzibbur…)
i would suggest, what is my opinion, even a better kabalah:
try NOT to finish Shemoneh Esrei before the Tzibur.
by trying to take your time with more concentration, feeling and Kavanah, and thinking about HaKodeshBarchu and trying to feel His presence
there is a time for Learning and there is a time for Davening. during the time for Davening, work on THAT. (one mans opinion)