One thing I noticed straight away.  It has its own denoiser built in somehow.  Make sure when you use it, you disable the render denoiser in Cycles.  If you don't do that, it may override them anyway, but I've been experimenting and so far noticed it may actually take extra time for it to do that.  Make sure you watch the videos showing the creator using the addon, because that helped me. I was a little confused as to why render times were exactly the same no matter what sample count I chose.  Come to find out the reason for that is because it will only consider your input samples when you use the "User" preset.  If you use the "low", "medium" or "high" presets, it overrides any of your manual values with preset internal values of its own.  So even if you have render samples set to 64, for example, it will not use that value unless you choose "user" preset.

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