Nodding furiously along to @AndyDavies as he describes perf hits & risks of invalid A/B tests in many A/B testing libraries.
Doing it CDN level is the only way to get real comparison. Do it with @Netlify with a couple of clicks!
https://medium.com/netlify/10-netlify-features-to-surprise-and-delight-225e846b7b21#c751
#SmashingConf
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