Cache ScriptEngine and CompiledScript to eliminate filter performance bottleneck #434
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Problem
Filter execution was causing 70-90% CPU spikes and frequent timeouts due to repeated creation of ScriptEngineManager and ScriptEngine instances, plus repeated JavaScript compilation on every filter execution.
Solution
Implemented caching for ScriptEngine instances (per file extension) and compiled JavaScript bytecode (per filter script). ScriptEngine cache uses ConcurrentHashMap with singleton ScriptEngineManager.
Files Changed
ExternalScript.java: Added ScriptEngine cachingScriptRunner.java: Added CompiledScript caching with isolated contexts