I want the best speed operating system.
There are many things to determine the best OS, and many of these things are subjective.
I want to ask one general question here, We have seen 32 bit and 64 bit Operating System.
Is there any other larger size bit Operating System exist?
First, you need to understand what 32 and 64-bit means.
The benefits of having a 64-bit OS or program over a 32-bit doesn't really have to do with speed, but with the increased number of memory addresses that can be utilized by the by the system by RAM or page swapping.
These memory addresses store information that is going to be processed by the system. The bigger the "bit" the more addresses you can have, and the larger amount of information can be stored.
For example, a 1-bit system can store two options, either one "1" or one "0". This would be two memory addresses.
Here is the math for maximum
theoretical memory addresses:
1-bit = 2^1 =
2 memory addresses
32-bit = 2^32 =
4,294,967,296 memory addresses, or about 4 GB worth
64-bit = 2^64 =
18,446,744,073,709,551,616 memory addresses, or about 18,000,000,000 GB worth
So, the theoretical maximum amount of memory addresses in the 64-bit system is a lot higher than the RAM that any Mac has, and this will probably be the case more many years to come. I guess with an insane amount of VM, this limit could theoretically could be reached, but the MacOS probably has a limit on the maximum amount of memory addresses anyways.
32-bit runs out of address around 4GB, so OS or apps that use this would be considered dated.