Some Windows users have reported a significant slowdown of Dynare preprocessing on Windows since the end of February 2024. The delay appears seemingly at random, with some runs taking forever and other happening as fast as expected.
The culprit seems to be a recent update of the Windows Defender. The problem manifests in significant CPU and memory usage of the “Antimalware Service Executable” shown in the Windows Task Manager.
A solution is adding an exception to the Windows Defender for the Dynare folder:
In windows press Start > Windows Security > Virus & threat protection > Manage settings under Virus & threat protection > Add remove exclusions > Add an exclusion > Folder > "C:\dynare"