Unfortunately, I don't have a fix but maybe a work around. I make sure I add my cas session & any libname & caslib statements to my autoexec file (you can edit your autoexec by selecting Options -> Autoexec):
Example:
cas; libname casuser cas;
caslib _ALL_ assign;
/*- Any other caslib or libname that want at start-up */
Then if performance becomes sluggish - I just reset my session by selecting Options -> Reset SAS session
Hope this helps
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