If you use the search function at the top of this page, you should see this topic (re soft soft performance) recently came up here. Regarding performance of interface mode (vs switch mode) on the little guys, that would be a good question; on the bigger hardware I do not think that is much of a performance impact (especially on 5.0.x.).
NSE4/FMG-VM64/FortiAnalyzer-VM/6.0 (FWF30E/FW92D/FGT200D/FGT101E/FGT81E)/ FAP220B/221C
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