Thanks to all of you for sharing your performance reports and support cases - they helped us to identify the bottlenecks in Veeam B&R code. As a result, now we have a new optimized engine in v9.5!
File to Tape performance has improved by up to 50x when processing large amounts of very small files, making it up to 50% faster than leading legacy tape backup solutions on the same workload. The new engine was tested with 20 million files per job, enabling users to efficiently protect unstructured data to tape or VTL targets.
Other optimizations. Additional optimizations include multiple, under-the-hood enhancements improving stability and performance of GFS archival, parallel processing, tape encryption, file level recovery and catalog operations.
That said all the tape jobs (file to tape, backup to tape and GFS to tape) were optimized to work as fast as possible. Feel free to test tape performance enhancements and do not forget to share the results.
More information regarding new features - Whats new in 9.5