Hello,
to partially answer your question: the ISR 4331 has a base throughput of 100MB, with the Performance license you will get 300MB, and with the Boost license you get over 2Gbps. The throughput is activated in software.
Check Table 4 of the attached document.
https://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integrated-services-routers-isr/data_sheet-c78-732542.html
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