Procedures in SAS 9.4 freeze when there is a typo, e.g., in a variable name. SAS says "Processing submitted statement" and the Break icon usually does not respond or responds very slowly. The data set I am currently working with is quite large - ab 1 million records, although I had similar problems with much smaller datasets and with SAS 9.3. It has been going on for > a year. I contacted SAS about this and other problem, had SAS reinstalled, as they recommended, but it did not solve the problem with freezing. Things are usually better at the beginning of SAS session and quickly getting worse over a couple of hours or less, even though I regularly clear log and results window. The severity of the problem depends on the time of the day and it is better after hours, although SAS is locally installed and the data are stored locally too. I intentionally do not use work library, partially b/c it is on the network (out IT department chose it as a default) . So far only killing SAS works, but I have to do it every 30-90 minutes. I often use HTML output, I know it makes SAS work slowly, but I am not sure about the connection btw the output type and the Break icon performance . Why does it happen and what can help? . Thank you