The first time it happened I thought something had gone wrong
I had done the upgrade to 0.7.30 earlier today that I guess had created the cache. I then upgraded to 0.7.31 a short whiole ago as recommended for Windows users and noticed the great improvment.
I thought it was worth expressing my thanks for the improvement, and also to encourage others who have a similar use profile to make the upgrade to get the improvment for themselves.