Scrolling slowdown?

[Travis]

VensimDSSMC v10.2.1 seems more sluggish in the last fews months. This is both for me and a colleague. We don't know if it is a Vensim update or maybe related to the release of macOS15 Sequoia. We're scrolling through some pretty big views with embedded graphs and lots of variables. It was always laborious, but not it is almost unworkable. For instance, you can click on the scrollbar to scroll and count to 3 before something happens. Of course, the delay means you've clicked again, which makes it worse, etc. It definitely wasn't this way in, say, September.

Is anyone experiencing this?

(Apologies in advance for not being to really regress this issue.)

[aliakhavan89]

I'm on VensimDSSMC v10.2.2, macOS 15.1.1, and I have an m3 MacBook Pro. In my experience, having several embedded graphs makes scrolling a bit sluggish. However, I've noticed that the zoom level impacts the performance. If I zoom in enough, the issue is resolved (maybe because there will be lower load on cpu/gpu). This has been my experience with all recent versions of Vensim and macOS.

[Administrator]

VensimDSSMC v10.2.1 seems more sluggish in the last fews months. This is both for me and a colleague. We don't know if it is a Vensim update or maybe related to the release of macOS15 Sequoia. We're scrolling through some pretty big views with embedded graphs and lots of variables. It was always laborious, but not it is almost unworkable. For instance, you can click on the scrollbar to scroll and count to 3 before something happens. Of course, the delay means you've clicked again, which makes it worse, etc. It definitely wasn't this way in, say, September.

Is anyone experiencing this?

(Apologies in advance for not being to really regress this issue.)

I'm not aware of any Sequoia problems. If you can share the model, we can take a look.

All I can really suggest is splitting the diagrams up and placing things on separate views (which is good practice anyway).

[Administrator]

I'm on VensimDSSMC v10.2.2, macOS 15.1.1, and I have an m3 MacBook Pro. In my experience, having several embedded graphs makes scrolling a bit sluggish. However, I've noticed that the zoom level impacts the performance. If I zoom in enough, the issue is resolved (maybe because there will be lower load on cpu/gpu). This has been my experience with all recent versions of Vensim and macOS.

Zooming in helps as there is less to draw on screen, only the visible portion of a sketch is drawn. When zoomed out, Vensim has a much larger area to draw (and rescale)

[Travis]

Well, I"m Zoomed at 100% in this model.

Admin – it is the Energy Policy Simulator model. You likely have it already, but you can download a version here (Note: I'm using v3.3 and v3.4, but I'm sure v4 is the same):
https://github.com/EnergyInnovation/eps ... /4.0.3.zip

The Web Application Support view toward the bottom is particularly problematic.

[aliakhavan89]

I just tested it, and I have the same scrolling problem on M3 Max. During scrolling, Vensim CPU utilization reaches to 100%. Something I've noticed is that navigating with scroll bars are faster (but still much slower than what it's supposed to be). Ironically, as you mentioned in the other post, scroll bar seems to disappear on your machine. Anyway, I would assume that the inertia that macOS creates during natural scrolling (for example, when using the trackpad) overwhelms Vensim, which is really odd. Maybe the core code can benefit from some behind the scenes optimizations.