c# - How many Tasks are too many -

i working on spaceship shooter style game. in game there slow moving missiles run on different tasks.

task t4 = new task(() => fireshipcannons()); 

they don't much; move small bitmap across screen. loop 30 iterations. problem timing off , tasked seem take priority on others. many important note control speed of missiles using thread.sleep(100). because of slowing down, method run few seconds.

i using c#, .net, windows form application

i have spent hours thinking how reword this, , think worded correctly. problem having broad; yes, question may bit broad. got great answer! not indicate question asked correctly?

since using tasks (good), can make them async tasks , use await task.delay(time).

    async task fireshipcannons(cancellationtoken ct)     {         (int = 0; < distance; i++) {            await task.delay(100, ct);            drawbitmap(i);         }     } 

this way not tie 1 thread every bullet. tasks slow because reach limit of threadpool, should lot faster. additionally, should check if task.delay has taken more 100 ms suggested. if did, draw bullet 2 spots further instead of 1, , reschedule accordingly.

    async task fireshipcannons(cancellationtoken ct)     {         var start = datetime.now;         while (bullet.isonscreen) {            drawbitmap(bullet);            var sleep = (start.add(timespan.frommilliseconds(100.0)) - datetime.now);            if (sleep.milliseconds > 0) {                task.delay(sleep, ct);            }            iter = (int)((datetime.now - start).totalmilliseconds / 100 + 0.5);            bullet.movesteps(iter); // move iter steps.            var start = start.addmilliseconds(100 * it);        }     } 

lastly, might idea not hammer draw function new calls every bullet, instead combine bullets/changes single render function calculate changes , sends them off in 1 go. depend on how draw function implemented.