Dell R630 with Crucial BX500 IO bottleneck?

I have a couple Proxmox Dell R630 servers with a raid 5 of (6) BX500 SSD. Everything works for the most part but I have to throttle the restore VM bandwidth down to about 30 MB/s to not have a huge impact on other VM’s. Is this normal? I know these SSD are not great, but are they the bottle neck in this? These servers do seem susceptible to IO wait but I don’t have anything with different SSD to compare to. Would other SSD’s make a Signiant difference?

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