High CPU usage on x86. Fix: You likely hit the memory limit. Convert to the x64 version of 9515.
Many veterans argue that the OCR (Optical Character Recognition) and conversion engine in Nitro Pro 9 was superior to later versions. It preserved complex tables and column layouts better than Adobe Acrobat of the same era. The "9515" build is often cited as the peak of that engine. nitro pro 9515 final x86x64 top