I am trying to find the action of Hecke operator T_{25} on the modular form F = \eta(24z)^{11} \Delta(24z) E_4(24z)^{2} using mfhecke(mf, F, 25) but it is not working. Here, mf = mfinit(F), although because the dimension is huge, it enters into a loop at this point. How should I fix this?