more granular cache for tiny speed up
more granular cache for tiny speed up

mcanthony/libvips,lovell/libvips,wishabi/libvips,lovell/libvips,leiyangyou/libvips,wishabi/libvips,jcupitt/libvips,jcupitt/libvips,wishabi/libvips,leiyangyou/libvips,leiyangyou/libvips,lovell/libvips,jcupitt/libvips,mcanthony/libvips,mcanthony/libvips,leiyangyou/libvips,mcanthony/libvips,wishabi/libvips,jcupitt/libvips,lovell/libvips