Performance & UX improvements

[ifoche]

Parent of #2355, parent of #2352, parent of #2353, parent of #2356, parent of #2357, parent of #2358, parent of #2348, parent of #2354, parent of #2372, parent of #2384, parent of #2385, parent of #2377, parent of #2374, parent of #2381, parent of #2375, parent of #2376, parent of #2383, parent of #2379, parent of #2395