Why is TIRPN causing my TI-89 Titanium to run slowly?

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jimalex
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I loaded TIRPN on my TI89 Titanium, and when it runs, the busy indicator stays on and the app runs very slowly. VERY Slowly. But it does function, and I can exit the app back into the regular worktop and the system recovers its speed. My calc is not fully loaded down with apps.

Is something wrong with the app, maybe, or is my calculator trying to crash? Any Ideas what I should do?
 
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I forgot to mention, TIRPN is an rpn environment. It appears to be the best one, from what I could tell (as there are more than half a dozen to choose from). There isn't much out there saying people have had a hard time with it.
 

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