Workflow memory leak

Hi I have couple of workflows which are implemented as follows:

 

1) Workflow 1 queries a table using sql and loops through the records then pass id to 

 

a second workflow

 

2) Workflow 2 uses the id from GetExternalValue and does query tasks, pan to and highlight feature on map and

 

displays some counts in a display form

 

3) Workflow 1 runs on startup, and runs until browser is closed.

 

 

The above works but the memory usage seems to be increasing continuously and is causing timeout.

 

If I remove the display form the memory usage is more constant.

 

 

The display form contains a number of markdowntext, images and text area objects

 

I have set all the objects I am creating to nothing at the end of workflow 2, but this doesn't seem to help much.

 

 

Does anyone know how to force releasing objects from memory in a workflow ?