Is there any good way to "synchronize low speed threads with high speed threads"?

Hi everyone, happy new year!
I have a RTX V5 thread flag related issue:
In my program, TaskA needs to wake up TaskB frequently under certain circumstances. TaskB is a low-speed device (LED blinks). In this case, what adverse effects does TaskA frequently call osThreadFlagsSet?
I always feel that this is not very good. Is there any good way for you to "synchronize low speed threads with high speed threads"? Thank you !

Code show as below:

Note: TaskA has higher priority than TaskB.

void TaskA (void *argument)
{
    static uint32_t flags;

    while(1)
    {
        // Alarm generated every 10ms

        
        flags = osThreadFlagsSet(ThreadIdTaskB, 1);
       

        osDelay(10);

    }

}

void TaskB (void *argument)
{
    static uint32_t flags;

    while(1)
    {
        flags = osThreadFlagsWait(1, osFlagsWaitAny, osWaitForever); 

        LED(1);
        osDelay(500);
        LED(0);
        osDelay(500);

    }

}