Here are my empirical results:
Windows 10 Pro 1703 x64
32GB RAM
With all options cleared and only Cleaner > Windows > Empty Recycle Bin checked, clicking Analyze causes runaway memory consumption. Within seconds, all 32 GB is allocated to CCleaner.
If I allow the process to continue, the screen eventually blanks and the computer becomes unresponsive. The only way to recover is to forcibly power off the computer and restart it.
Following the instructions to clean a corrupted recycle bin (Corrupted recycle bin fix for Vista, Win 7, Win 8 and Win 10, helpfully posted by hazelnut), the cleanup process takes 20 or 30 seconds.
After that, CCleaner runs with no issues.
