[Tim Evans]

The UML perspective cannot be used longer than ~5 minutes, because it
causes the the whole workbench to hang. I tried to figure out if there
are any specific conditions under which the fault could be reproduced.
The answer is yes – it happens when I use the Properties View. I managed
to draw quite large diagrams if the props view for UML was not used. However, this view is essential.

We are using MyEclipse under Linux

[Kapil Kapre]

What are your cmd line options? Is the issue the UML Perspective specifically or just the properties view? Try adding this to your eclipse shortcut
-vmargs -Xms128M -Xmx512M -XX:PermSize=64M -XX:MaxPermSize=128M

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