Previously you can exceed maximal number of opened files if you have got
many packets in the spool directory.
+@item
+Optimization: do not close file descriptor of the file we download
+online. Previously each chunk lead to expensive open/close calls.
+
+@item
+Online downloaded files are saved with @file{.nock} (non-checksummed)
+suffix, waiting either for @command{nncp-check}, or online daemons to
+perform integrity check.
+
+@item
+Optimization: files, that are not resumed, are checksummed immediately
+during the online download, skipping @file{.nock}-intermediate step.
+
@end itemize
@node Release 6.0.0