You lose all DLCs released after Barbarossa (NSB, BBA, AAT, Götterdämmerung).
| Metric | HOI4 1.5.4 (32-bit) | HOI4 1.13+ (64-bit) | | :--- | :--- | :--- | | Max RAM usage | 3.2 GB (crashes at 3.5 GB) | 8-12 GB (stable) | | Late-game speed (1943) | 20-25 seconds per month | 10-15 seconds per month | | Mod compatibility | Only pre-2018 mods | All current mods | | Crashes per 10 hours | 3-5 (memory related) | 0-1 | hoi4 32 bit