When processing a small number of spectra, CLASS90 will be quick on
whatever kind of computer. Now, if CLASS90 users needs to process
dumped spectra, they should then be prepared to use a powerful
computer (with lot's of RAM to avoid swapping) and to wait during
processing, whichever software (in particular whichever version of
CLASS) they are using.
Moreover, flexibility is favored in CLASS90. This means that the same
things may be done in many different, more or less efficient ways. It will
take time to the CLASS90 community to learn what should be or not be
done to ensure efficiency. For instance, loading with the
LOAD command (see below) on a laptop is probably going to take a
while (if possible at all due to limitation in RAM memory). However, this
possibility does not even exist within CLASS77.