The fc mobile game is lagging in the match whenever I open it for the first time

The fc mobile game is lagging in the match whenever I open it for the first time. In every match first it's playable but after the half time of the match it almost dropped to 10-15 fps. But after restarting the game it disappears. The gameplay becomes smoother, it gives 50-55 fps continously. My device is samsung galaxy a55 5g