The promotion engine slows down drastically with larger numbers of promotions. You do not want to get to 100000, or even anywhere close. There is no official number because it depends on many variables (more complex rules are 'heavier' for example. My personal rule-of-thumb (based on projects I have been involved with) has been that it performance will start to decrease at 2000-3000, it will be noticeably slower over 5000, and you don't really want to get over 10,000 rules. There are a number of problems with large rulesets, one of which is memory allocation in the JVM as it all gets loaded into memory on each node as a single Drools RETE network.
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