Is there a faster alternative to python's Decimal?

You can try cdecimal:

from cdecimal import Decimal

As of Python 3.3, the cdecimal implementation is now the built-in implementation of the decimal standard library module, so you don't need to install anything. Just use decimal.

For Python 2.7, installing cdecimal and using it instead of decimal should provide a speedup similar to what Python 3 gets by default.

The GMP library is one of the best arbitrary precision math libraries around, and there is a Python binding available at GMPY. I would try that method.

You should compare Decimal to Long Integer performance, not floating point. Floating point is mostly hardware these days. Decimal is used for decimal precision, while Floating Point is for wider range. Use the decimal package for monetary calculations.

To quote the decimal package manual:

Decimal numbers can be represented exactly. In contrast, numbers like 1.1 do not have an exact representation in binary floating point. End users typically would not expect 1.1 to display as 1.1000000000000001 as it does with binary floating point.

The exactness carries over into arithmetic. In decimal floating point, "0.1 + 0.1 + 0.1 - 0.3" is exactly equal to zero. In binary floating point, result is 5.5511151231257827e-017. While near to zero, the differences prevent reliable equality testing and differences can accumulate. For this reason, decimal would be preferred in accounting applications which have strict equality invariants.