Some opera loading related configuration switches:
- opera:config#Performance|WaitForStyles - default 5000 milliseconds
- opera:config#Performance|WaitForWebFonts - default 5000 milliseconds
- opera:config#UserPrefs|FirstUpdateDelay - default is 1 second imho
There are some more settings in the performance section of the opera:config
page (reflow, throttle etc.).
The first update delay setting is reflected in the Opera advanced settings dialog: <ctrl-f12> -> Advanced -> Browsing -> Loading -> Redraw instantly|after N seconds|after loading
So the 45s css file from https://github.com/scottjehl/css-inapplicable-load leads to about 6 seconds wait time in Opera (Redraw instantly after 1 seconds and the 5 seconds wait time for styles apply). Setting "Redraw instantly after 10s" leads to display after 10 seconds as that 5 seconds wait time for styles timed out.