What is a good Mail Optin plugin that has minimal impact on speed and works with caching plugins ?

I had narrowed down my list to Thrive Lead and Convert Pro. However, upon further research I learned or I saw an issue on a Cloudlfare Discussion how 1 guy had an issue with it since it was not working with CLOUDFLARE.
Since I will not be using any of their fancy modules, I am thinking maybe I should use a Forms plugin instead ?


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