Look for "Minimum framerate' in this document: https://www.scirra.com/tutorials/67/del ... dependence
10-15 fps is a serious deviation from the 'acceptable fps that is smooth correctable by dt'.
The best solution is to optimize the game.
Setting the minimum framerate to 10 is a no, no.
Collissions will not be dedected and all sorts of other culprits.
You can make a timer based on the expression 'wallclocktime'.
The maximum error will then be the timeresolution, beeing 1 * dt, but usualy 1/2 * dt.
Dont use =, use > or <.
But, altaught this timer will be reasonable right, still ....
The BEST solution is to optimize the game, to keep dt between realistic boundarys.