### Release 6.1.0 ¶

- Optimization: most commands do not keep opened file descriptors now. Previously you can exceed maximal number of opened files if you have got many packets in the spool directory.
- Optimization: do not close file descriptor of the file we download online. Previously each chunk lead to expensive open/close calls.
- Online downloaded files are saved with `.nock` (non-checksummed) suffix, waiting either for `nncp-check`, or online daemons to perform integrity check.
- Optimization: files, that are not resumed, are checksummed immediately during the online download, skipping `.nock`-intermediate step.
- Ability to store encrypted packet’s header in `.hdr` file, close to the packet itself. That can greatly increase performance of packets listing on filesystems with big block’s size.