How Game Updates and Patches Work on PC

Types of Game Updates

Content updates: Add new maps, characters, items, story chapters. Usually large (1–10+ GB). Balance patches: Adjust game mechanics, character stats, or weapon damage values. Often small (50–500 MB). Bug fix patches: Address crashes, graphical glitches, or gameplay issues reported since the last update. Hotfixes: Emergency fixes for critical issues (exploits, server crashes). Sometimes applied server-side without a client download. Engine updates: Rare updates to the underlying game engine, often used to improve performance or add new rendering features.

How Steam Delivers Updates

Steam downloads and installs updates automatically by default. The process: 1. Steam downloads the changed chunks of game files (not necessarily the full game) 2. A patching algorithm applies the changes 3. The old files are replaced Steam uses delta patching — only downloading the parts of files that changed, not the entire file. This is why a 30 GB game might only need a 2 GB download for an update.

Why Updates Can Break Performance

Sometimes updates change graphic settings, reset configurations, or introduce new rendering code that performs differently than the old code. After major game updates:

• Check if your graphics settings were reset to defaults
• Watch for driver update recommendations from the GPU manufacturer
• Wait a few days for emergency hotfixes if the update introduced new issues

The "Day One Patch" Phenomenon

Many games ship with a large day-one patch — sometimes larger than the disc or base download. This is because certification and manufacturing lock the initial version months before release, and development continues.