Hab grad was zu den lags in der Version 1.2.18 von xavierjohn22 (ein Miui Entwickler) bei den xdas gefunden :
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The LAG is because of a battery monitor bug connection.
IF you enabled battery monitor, phone will not lag, but consumes more power. Other than that it is fast and okay
They studied that if you turn on trhe battery monitor on then off it would be okay for half an hour or 1 hour then lag comes again.
thats why a permanent fix is release as 1.2.19
Deshalb habe ich die Probleme wohl nicht da bei mir der Batterie Monitor an ist.