I Can 39;t Download Genshin Impact

Before i play genshin impact on ios 13.7 then i update it on ios 14. Then i open genshin impact on ios 14 it stuck at white screen. and 1 minute it can play but it crash on 10-15 minutes of gameplay. So apple can you please fix the performance and ram management on ios 14 just like before you are ruining the older devices. it can cause an issue again pls fix it.