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Is there a way on macOS to tell Wireshark to use more CPU/memory

I'm working on a capture file of about 5.5G, or about 18 minutes of traffic on a local lan. I'm trying to analyze it on a 2019 iMac with a core i9 and 24GB of RAM with a 1TB SSD -- IOW, a machine with plenty of horsepower.

Yet Wireshark seems to be using only trivial amounts of CPU and memory, according to iStat Menus. Is there a way to tell Wireshark to "go to town" and take all it can get from a machine in hopes of speeding performance?