The only thing I´d see potentially cause issues is the first event. It spawns those green Sprite instances when you are moving at the rate of your current fps. So for a 60hz monitor this will spawn 60 instances for every second you move. Or a 144hz will spawn 144 instances per second. This will add up quickly the longer you move. The other event that spawns the Sprite4 will also do that, so obviously even more sprites per second. But those at least time out at some point so there is an upper limit on how many can exist at once.
You should either limit the amount of Sprites you spawn (like using every 0.1 seconds) or periodically paste all sprites onto a canvas and delete them. After doing that though you cannot change them anymore other than painting over them I guess. I do the canvas thing in this example wackytoaster.at/parachute/stucksnowcanvas.c3p with the snowflakes.
And you can also check the debugger to see what eats up performance.