Speeding up Cygwin login

On Windows I use Cygwin extensively. So I open a lot of login shells. However these shells are sometimes slow to load, especially when my host is busy with other jobs.

While editing my ~/.bash_profile I noticed code like this:

if [ -d "some path element" ]; then
    PATH="some path element:$PATH"
fi

This is a common idiom. However, it is making a separate fork to /bin/test every time.

A simple improvement:

if [[ -d "some path element" ]]; then
    PATH="some path element:$PATH"
fi

A little trying it out and the verdict: Wow, big improvement.