The .web file took very long to load but finally did. But that didn't surprise me when I saw it contains 123 pages! This probably causes updating text across variants to slow down too. I notice the same lag on my computer (Intel Xeon 2.4 GHz, 24 GB, Windows 10 Pro 64-bit). You might want to cut up the site into smaller 'bites' or else learn to live with it. The site itself is quite responsive after publishing it locally, which didn't even take that long.