[LMDB] Performance on AWS/Windows

Hi,

I'm using LMDB for mapping MD5 hash codes to some data. I noticed that a virtualized environment (Xen/Windows on our own servers and AWS/Windows) slows down LMDB significantly (e.g. a certain workload is executed in 30 minutes on a local machine vs. 15 hours on AWS).

My application also has an implementation in SQLite which is slower than LMDB on a local machine. But its performance is similar on AWS. The rough numbers are something like

Local:

- LMDB: 30 minutes - SQLite: 45 minutes

AWS:

- LMDB: 15 hours - SQLite: 50 minutes

I wanted to ask if there is something I can do to speed up LMDB on AWS? Maybe I'm missing something obvious.

Thanks,

Jürgen