Oxwall Plus have cache mechanism, which can speed your site. I perform test using file cache system. I have two sites with the same plugins, one is based on Oxwall, second is based on Oxwall Plus. Here results.
Maipage
Oxwall Plus
Page load: 0.089s (4MB)
Database: 47 queries (0.011s)
Oxwall
Page load: 0.782s (16.5MB)
Database: 83 queries (0.074s)
Blogs
Oxwall Plus
Page load: 0.074s (4MB)
Database: 38 queries (0.009s)
Oxwall
Page load: 0.220s (12.5MB)
Database: 66 queries (0.025s)
Forum
Oxwall Plus
Page load: 0.095s (4MB)
Database: 61 queries (0.019s)
Oxwall
Page load: 0.297s (11.75MB)
Database: 72 queries (0.043s)
If site grows, have more and more users, then page is loading longer and longer. Oxwall Core have caching methods, but don't use it.
Oxwall Plus have two cache systems. First is DB Cache, which user MySQL tables, where stored are serialized data from MySQL queries. If you select all rows from MySQL table, then you can cache it and only refresh cache when you add, edit or delete row. Second is File Cache System, which stored serialized data in files. Using second system you can reduce MySQL queries.
Oxwall Plus have feature to minimize all CSS an JavaScript scripts and declarations, you can store it on separate files, which are refresh when add new CSS/Javascript file or when you refresh cache.