We recommend that you don't cache all the layouts because it uses a lot of additional memory to do so. Use the setting where model space and the current layout are cached and let release the memory from the other layout.
Peter, does this still apply even with 24GB of memory? I don't know if I've seen performance change regardless of the cache settings but just curious.
If you work at it, you could burn 24gb of memory if you cache all the layouts (it might take an excessive number of drawing elements and layouts, but it could be done). You have to change to the layout before it is cached. You might get bored before you run out of memory.
The last informal testing of this I did (we were trying to blow out the memory) the cache was created after the layout was drawn and the cache took a period of time to save. If you are just walking down the layouts (for a plot) and not going to reuse the layouts, this is additional time and memory that the system uses that gives no benefit. If in some workflow (that I can't think of you) are flipping between a number of different layouts all day long, then it would useful.
For most people and most workflows I think setting it to only cache model space and the current layout should be fine. If you don't really use the layouts that much, then no cache may even work better.
If in some workflow (that I can't think of you) are flipping between a number of different layouts all day long, then it would useful.
Most of the projects I've worked on we tiled the project up for each type of drawing, four horizontal control plans, four grading plans, four erosion control plans, etc. When working on any one type of drawing, I'll have all four in the same drawing with different layouts and I end up switching back and forth between them quite often to see how changes to the model appear in the sheets or simply working within the viewport. In this situation I would definitely want all the layout cached.
What I usually recomend is to set AutoCAD to cache all layout tabs (provided you have a lot of available RAM) and then, if you notice a performance hit to AutoCAD, then change it to cache just the model and last layout. The problem with this recommendation, you have to remember that you set AutoCAD up this way and how to change it if the system starts to lag. For advanced users, it shouldn't be a big deal. If you aren't all that familiar with how AutoCAD works (especially in this area) or you have newer users then I would recommend to set it up the way Peter recommends.
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