  The minimum time a system needs to change from an initial state to a final
orthogonal state is called quantum speed limit time. Quantum speed limit time
can be used to quantify the speed of the quantum evolution. The speed of the
quantum evolution will increase, if the quantum speed limit time decreases. In
this work we will use relative purity based bound for quantum speed limit time.
It is applicable for any arbitrary initial state. Here, we investigate the
effects of filtering operation on quantum speed limit time. It will be observed
that for some intervals of filtering operation parameter the quantum speed
limit time is decreased by increasing filtering operation parameter and for
some other intervals it is decreased by decreasing filtering operation
parameter.
