These entries are quite repetitive, esp. the all-zero entry for uncased characters (but not only: there are also 137 non-zero duplicates), and each one takes 8 bytes of the total 20 bytes of sizeof(Properties). Make a new array with these entries and only store an index into it in Properties. The new array happens to have a size of 448 entries (down from 3372 unique Properties), so 9 bits would suffice for the index, but a sizeof(Properties) == 14 is probably rather pointless, so add a reserved field to prop the struct up to 16. That sounds like the ideal size for rapid indexing and probably improves qGetProp() performance, esp. if case information is not needed. Theoretically, this should save 3372 * 4 - 448 * 8 = 9904 bytes. The TEXT size of libQtCore, however shrinks by a bit more, 10596 bytes, on optimized Linux AMD64 Clang 19 builds. Picking to all active branches, because the Unicode tables are still maintained in all of them. Fixes: QTBUG-139427 Pick-to: 6.10 6.9 6.8 6.5 Change-Id: If4dc47ef06c674ad0263f0623ec408a25b977b3a Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>