| Characteristics | FFT | FIT |
| Separability | Yes | Yes |
| Compact support | No | Yes |
| Instantaneous spectral attributes | No | Yes |
| 1D computational cost | O(N*log2(N)) | O(N) |
| 2D computational cost | O(N2*log2(N)2) | O(N2) |
| Energy treatment | Disastrous | Excellent |
| Decimation | In time or frequency | Not required |
| Parallelization | No | Yes |