[codefined]

Looking at the Dutch site on my phone (Samsung S10) I noticed it took a little while to load compared to the nigh instant loading of the UK Gov variant. Looking at Page Insights [0] [1] tells a similar picture. Desktop time to interactive times of 0.4s Vs 3.5s and Mobile time to interactive times of 4.5s Vs 13.1s.

The Dutch website seems to spend a lot of that time running the Next JS framework stuff, which the Gov.uk variant does not. It might work quickly on fast computers, but even on modern phones it seems to visibly pause.

[mmcnl]

On my iPhone Xr, older than S10, it loads very fast. Also performance depends on which page you benchmark. Landing page is faster for UK, but the cases pages is about twice as fast for the NL dashboard (time to interactive 2.4s for NL vs 4.4s for UK). Also first meaningful paint is faster (0.5s vs 0.8s). This proves that you can get decent performance without an overly bloated costly architecture.