I have a Mid 2010 MacBook (2.4 GHz, 4GB) on Sierra which has always felt slow no matter which version of the operating system it has been on. My other (similarly specced) Mac, a Late 2009 Mac mini (2.53 GHz, 4GB), has never felt slow. But it hasn't and can't be updated beyond El Capitan. The MacBook takes a long time to get going. I tend not to turn it off because it takes 20 minutes ish after turning it on for any application to work normally. Once it's going, it can be ok for long periods of time. But it can also just hang for long periods. I have done clean installs every time I have updated the OS on the MacBook. Should I now update High Sierra? Will updating making things better or worse for me?