Hi philgdep,
Ah okay. No deleting that class file is the beginning and the end of solving that issue (well, you probably already had to restart Mango) What slowed down?
One of the lowest hanging fruits to speed up a Mango is to change the database stream type in the env.properties file. Try setting
db.nosql.shardStreamType=MAPPED_BYTE_BUFFER
in env.properties and restarting.