Any time a SAS program does not run as expected, the proper first step is to review your SAS log as already mentioned by @ballardw
Search the SAS log for any errors or warnings. If there are then you need to investigate them and fix them. If there are not and it is just a problem of slow performance then find the slowest steps in your program. Are they slower than normal or not? Do your log observation counts look normal or not?
Also remember that if you are using a remote SAS server, your program might be running slower because the server is heavily loaded with other users, and there is no issue with your program. To test this out run your program outside of normal business hours. Does that speed it up a lot? Also talk to your SAS adminisitrators for advice.
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