Since late 2016 the installation of Stacey 3.0.0 utilised by this site has been ailing.
As more pages were added performance degraded. Once one hundred pages were reached things became intolerable.
A change of web host in May presented a way out. They supported newer versions of PHP allowing other CMS to be considered.
After a few experiments, Grav was selected and the site loaded into it. What a revelation - smooth navigation between pages, no more long waits during search and, perhaps more importantly, an active community.