First of all, if you want to speed up the jobs, it`s better perform bottleneck analysis
as proxy and repositories may be not the weakest part of the backup data flow.
As for your request, you can open Veeam ONE Monitor > Data Protection View, and review CPU/Memory performance of the desired proxy server. There is an option to review the resource usage by backup jobs.
I`ve get your other request and we are planning to extend the resource usage analysis and scheduling in the next product versions.