I've used Cadence OrCAD PSpice for mixed A/D simulations and not only feel really dated, it's relatively slow and it's also pretty buggy (a lot of mid simulatio

I've used Cadence OrCAD PSpice for mixed A/D simulations and not only feel really dated, it's relatively slow and it's also pretty buggy (a lot of mid simulation messages like "The program need failed and need to be closed"; Some project corruption that makes you create another one and add the files manually; Some analogue circuits that never converge, like oscillators that doesn't oscillate, but in other software and in a real circuit does). LTSpice looks dated, but at least the developer takes the simulation speed and the convergence to solve the circuits as a really important matter (specially compared to OrCAD PSpice): It can use multiple cores, it has 64-bit compiled binaries, and the developer uses a lot of tricks to get the maximum performance on every machine it runs. Without knowing how is Cadence Virtuoso and other more specific products, I don't imagine myself paying what this software does and having those problems. They aren't bad or they aren't improving, for sure, but I feel those companies are so specific that they simply don't care.