How many timers can run parallely in MATLAB?

I have three different types of sensors connected to a single PC. I am using three different timers to read data from those sensors at different frequency. However, I may need some more timers. So, is there any limit on how many timers can run parallely?

Another thing apart from these timers is receording data from another connected instrument which is controlled by C-shared library. But I am feeling that any command through loadlibrary function is taking a little bit of time to excute. Currently I am using appdesigner and somehow feeling the old GUIDE is much faster than appdesigner. Is it appdesigner or the multiple timers slowing down the process?

Any suggestion or comment is highly appreciable.