Just to answer the OP's question on SSD's.
Yes, they are non volatile and older spinning HDD's can be replaced with
them assuming your system has at least a SATA disk interface. There are
different types.
They do have limited data retention times though, earlier versions could
start to lose data after about 4 months if left un-powered. The latest
generation is better (> year ?) but figures are hard to come by and
depend heavily on temperature. For normal use this is not a problem.
There are much faster especially when accessing multiple small files as
there effective random seek time is very very fast compared with a
mechanical HDD.
Yes, the latest KDE5/Plasma is horrendously inefficient when it comes
boot times due to disk access requirements. With a spinning HDD system
boot times are really bad (minutes). A SSD helps this but obviously the
issue is really in KDE5/Plasma. With this aspect improved systems would
be so much faster better even with SSD's. I suspect the use of the
QtQuick (QtSlow!) technology is to blame reading loads of small files
describing GUI interface parts rather than just using C++. With a
standard fast HDD, a 3 GHz quad core i5 type machine takes much longer
to boot than an old 400 MHz single core Pentium Laptop with 256 MBytes
of RAM and an slow 2.5inch HDD running an old Fedora with KDE3. The
price of bad software "progress".
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