I've done the same calculations in Mathematica, Maple, hp prime pro app on windows (ios and Android), various calculator apps on ios and Android, etc

This is one of the things I calculated.

Capital Sigma (or series summation) of the cube root of e^[sin{atan(ln[3x^2+2x-3])}] summing from x=1 to x=1,000,000.

Desmos gave an answer in LESS THAN A SECOND on a mid spec Android phone. It took Mathematica, Maple, etc with 12th generation i7 processor many seconds to compute. All other math program apps in Android and ios (including TI Nspire and many more) took longer. Is it in the code? Superior algorithm?