Ok wow, maybe adding opal components to the qml booster is the way then, or having a separate opal-booster (last time I tested it there were noticeable improvements from adding more even silica ones Speed at which Sailfish apps launch - #6 by throwaway69 but a lot changed since then, then again the booster approach is likely to give much more speedup than reducing a read on a qml file by some percentage)
Edit: the boosters are rather small in terms of ram usage (200kb for the browser one?), if it saves a couple of seconds definitely seems like the way, if we’re talking about <0.1s probably not worth the effort, definitely worth retesting couple generations of hw later though