This is non-negotiable for serious players. StarCraft 2’s engine streams textures even on low settings. An SSD reduces "Preparing game data" from ~45 seconds to ~3 seconds. You can use Steam Mover or Symbolic Links to move the game without reinstalling.
Unlike older RTS games that loaded all assets into RAM, StarCraft II uses a tiered streaming system. During “preparing game data,” the engine: starcraft 2 preparing game data
On slower systems or HDDs, this phase is where you see the progress bar stall at 70% — it’s waiting for texture streaming pools to allocate. This is non-negotiable for serious players
Windows’ Fullscreen Optimizations can interfere with how StarCraft 2 writes its shader cache. On slower systems or HDDs, this phase is
One player has a modified map file (even accidentally, due to disk corruption). The checksum fails, and the match aborts. This is why ladder forces a map re-download if verification fails.