Performance isn't as simple as the speed of your CPU. The CPU is an important part of it, because it is where the application runs, and that application's job is to fetch or store individual I/Os.
Because the CPU's ability to deal with an I/O is now restricted by the patches available for these bugs, an individual I/O's latency will be increased. This might be important but it depends on the I/O requirements of your workload.
Will IOPS be affected? Possibly. Depends on how many parallel I/Os can be executed at once, and whether the CPU(s) is/are saturated. But then again, IOPS is the shittest and least relevant measure of performance, unless you are a vendor trying to quote a headline figure of irrelevance.
Will throughput be affected? If the CPUs aren't saturated, most likely not. Yes, latency will increase but for throughput workloads latency is irrelevant anyway.
Of course, this assumes that your storage system is just doing I/Os and nothing else. If you're taking snapshots or doing replication etc. etc. then this will also be impacted as this requires CPU time and tends to be latency sensitive. Good luck if your storage still uses copy-on-write.