message: Add note about default cargo build from CPU performance PoV.
diff: @@ -115,6 +115,11 @@ After successfully compiling `libindy`, you will need to add the path containing
  * [Windows](doc/windows-build.md)
  * [MacOS](doc/mac-build.md)
  +**Note:**
  +By default `cargo build` produce debug artifacts with a large amount of run-time checks.
  +It's good for development, but this build can be in 100+ times slower for some math calculation.
  +If you would like to analyse CPU performance of libindy for your use case, you have to use release artifacts (`cargo build --release`).
  +
  ## How to start local nodes pool with docker
  To test the SDK codebase with a virtual Indy node network, you can start a pool of local nodes using docker:
  