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An extension helps with per site zoom factors. I use ZoomBySite but while looking if it is also in the new extension gallery I found Zoom. Untested.

http://www.cerimorgan.com/products/zoombysite/ https://safari-extensions.apple.com/details/?id=com.stefanvd...

Like you, I’m constantly zooming in or out because there is so much variation in font sizes and layouts. I wonder if Safari could be programmed to automatically adjust the zoom level of every web page, based on my preferred viewing style. Safari would need to take into account things such as preferred font size, current window size, etc.

In my case, it lags (up to two-three seconds) even if I set new tabs to about:blank. Haven't been able to find a workaround, and it occurs infrequently.

You might want to try doing a SCM reset. I was having the same issue and did an SMC and noticed that opening a new tab went back to being instantaneous (also using about:blank).