https://www.searchlogistics.com/learn/blogging/best-link-colors/
How Link Color Affects Conversion - Split Test Results
split test resultscolor
https://heatmap.com/blog/heatmap-site-speed
Does heatmap.com slow down websites? (Split Test Results)
heatmap’s innovation of Site Speed Protection has proven we have zero impact on website performance. Don't believe me? I'll prove it.
split test resultsheatmapslow