[TYPO3-mvc] delete reflection takes ages - performance of whole site goes down

[ralph]

i try to debug my first bigger extbase extension. well.. i was wondering 
why site generation takes long i am new to xdebug but i tracked down 
that i have several long lasting mysql transaction caused by reflection.
stack trace:
t3lib_DB->exec_DELETEquery >> t3lib_cache_backend_DbBackend->remove << 
t3lib_cache_backend_DbBackend->set 
<<tx_extbase_reflection_service->savetoCache << 
tx_extabse_reflection_service->shutdown <<tx_etbase_dispatcher took 
3.859ms and some more of them. anyone can give me a hint for performance 
improvements?