what does "within 10% of the performance of the C++" mean?

[publicocean0]

sorry what does "within 10% of the performance of the C++" mean?
10% less than c++? -> c++ 100 ops , java 90ops
10% in absolute -> c++ 100ops , java 10 ops

comparing other similar project in java the performance is comparable with c++ .... are you sure ?

[rustyx]

This project is abandoned.
See some benchmarks in this fork: https://github.com/pcmind/leveldb#performance

[Dain Sundstrom]

This project is in maintenance mode and only bug fixes are applied.