I have been using FME2026.2 -26333 - for all my current projects which includes analysing larger datasets (2-5mil records). These aren't really that large.
I have found when building the analysis with data cached FME can be highly unresponsive and lag when trying to modify the existing transformation. Adding a new transformer, modify an existing transformer, even moving objects on the canvas. The system will lag and can often crash.
My laptop is the highest spec our company supports - Dell Precision 7680, 1Tb HD, 6gb GPU, 32gb RAM.
Even clicking too quickly after the transformation is run for that transformer can crash FME.
Surely I’m not the only person with this issue? Stability in this version seems unbelievably poor which makes me wonder if this is known or overcome somehow.
Best answer by gareth-at-safe
Hi @onic007
You're not the only one, and I'm sorry about the crashes. FME 2026.2 (build 26333) has an issue where FME Workbench can lag or stop responding when Data Caching is enabled and the Data Preview window is open. It happens when you select a transformer or reader with cached data and then click an empty part of the canvas, so nothing is selected. We tracked this internally as FMEFORM-37770, and it is now fixed.
FME 2026.2.1 and later include the fix. In theFME Form change log, it's listed under 2026.2.1 as "Data Preview: Fix Workbench freezing when opening and viewing cached data". FME 2026.3 is the current version onFME Downloads. Until you can upgrade, closing the Data Preview window while you edit the canvas avoids the problem. Another option is to disable caching and use Inspectors.
This fix covers the freezing, and I haven't confirmed that it covers the crashes. If FME Workbench still crashes, pleaseopen a support case and attach the workspace log and any crash details.
You're not the only one, and I'm sorry about the crashes. FME 2026.2 (build 26333) has an issue where FME Workbench can lag or stop responding when Data Caching is enabled and the Data Preview window is open. It happens when you select a transformer or reader with cached data and then click an empty part of the canvas, so nothing is selected. We tracked this internally as FMEFORM-37770, and it is now fixed.
FME 2026.2.1 and later include the fix. In theFME Form change log, it's listed under 2026.2.1 as "Data Preview: Fix Workbench freezing when opening and viewing cached data". FME 2026.3 is the current version onFME Downloads. Until you can upgrade, closing the Data Preview window while you edit the canvas avoids the problem. Another option is to disable caching and use Inspectors.
This fix covers the freezing, and I haven't confirmed that it covers the crashes. If FME Workbench still crashes, pleaseopen a support case and attach the workspace log and any crash details.
