Obviously what I mentioned from the start:
Javascript has to be compiled first before run, and all objects loaded and processed, so performance will suffer on a weak PC which obviously is the main cause here, as the internet line is quite fast.
The CPU is core2 duo, (old) so it is obviously the exception, not the rule.
I believe that not many people still use a Core2 Duo (I searched for statistics but I couldn’t find any free ones).
I keep it in order to keep optimizing the code, as it is still more powerful (per core) than my recent mid-powerful cellphone. Otherwise I would be spoiled to approve almost anything I code at first try!
On the second computer which is recent and powerful, the loading times were very short as you saw on the profile I uploaded for you.