Drmemory uses up CPU

Hi, I run drmemory to check my application running on Linux, but the process almost used up all CPU resources, more than 85% I think, but when I run the application directly without drmemory, CPU usage is normal, about 1%~2%.

I heard that drmemory is more efficient than valgrind on memory checking, but it was not true in my test, could you help to give some advice about that?