Enhancement: Adaptive IO concurrency based on backend connections Many commands used hard-coded limits for the number of concurrent operations. This prevented speed improvements by increasing the number of connections used by a backend. These limits have now been replaced by using the configured number of backend connections instead, which can be controlled using the `-o <backend-name>.connections=5` option. Commands will then automatically scale their parallelism accordingly. To limit the number of CPU cores used by restic, you can set the environment variable `GOMAXPROCS` accordingly. For example to use a single CPU core, use `GOMAXPROCS=1`. https://github.com/restic/restic/issues/2162 https://github.com/restic/restic/issues/1467 https://github.com/restic/restic/pull/3611