C/C++

Using assembly you can make a program run faster than using program written in C/C++. Especially local variables, which can be removed, by using only registers (which cannot be accessed in high level language).

Most basic functions in C/C++ are written in assembly for the purpose of speed like the function strcpy, strlen. Which are written in assembly (as of the libraries of VC++). In tracing the function, you will see assembly immediately.

There are some software that fit using assembly, like hardware communication. Which includes software driver, etc. and some program that are fit using high level like C/C++, business software since maintenance is also part of the cost of developing software.

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Operating system and system software like anti-virus and firewall must be written in such low level so that they will execute much quicker.

As the computer grows faster, we users install and use more software. And programmers tend to use the potential of the faster computer (Game is a good example).(I think it’s proportional: more speed = more software = more memory usage .)

Even using such low-level or high level, if the algorithm of the software is slow, any implementation will not make it faster.

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Even I am using Java, which I considered the slowest language that I have used, since it is both compiled and interpretted.

More program especially business program doesn't need to run very efficient that it must be written in assembly. It's the logic and algorithm that count. Even you use assembly but the logic takes n * n to finish(I don't know how to write n square). It will be defeated by a logic that takes log n, n or even n * log n written in latest language.

Programmers tends to choose language which they can work/compatible with so that they can create software much faster.

The compilers are also being develop/upgrade so that it can be more efficient and have more options to give.

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