Manipulating MTU size in IPTables with mangle

I am looking for any and all pointers in regards to modifying or resetting MTU size with the mangle table in iptables. Specifically where in the iptables flow is it more efficient to modify MTU to increase throughput?

I have an OpenVPN server and have identified a bottleneck issue. Gone through the motions with the server/client.conf files and wanted to look into this next, but am pretty green when it comes to iptables.


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