Old 11-09-2017, 11:45 AM   #1
_Stevie_
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Default Sluggish MIDI Editor

Hey all,

this is something that I'm experiencing for a while now:
when moving the MIDI Editor content with the middle mouse button + dragging,
the GUI gets verry sluggish and unresponsive.
Watch the scrollbar in relation to the screen movement:

https://imgur.com/RBfRtDF

A fix is more than welcome!

Last edited by _Stevie_; 11-10-2017 at 05:14 PM.
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Old 11-09-2017, 08:47 PM   #2
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Could you post a larger gif please? That one's not big enough... Well the only time I've experiences a sluggish MIDI editor is when I've split very long and complex MIDI item into many separate parts with the "allow trimming of MIDI items when splitting" preference off. In such case, the MIDI data essentially doubles with each split, so you can wind up with too much for Reaper to handle smoothly at some point. Or is this happening always?
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Old 11-10-2017, 05:00 AM   #3
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No problem, I have the full sized gif here:
https://i.imgur.com/RBfRtDF.gif

But maybe I need to increase the frame rate. Not sure if it's really visible.
That issue is always happening, with small items, large ones, lot of notes, bunch of note.
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Old 11-10-2017, 05:41 AM   #4
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I just tried to record with 25 frames, but somehow the GIF format is not capable of fast frame rates.
So I made short video, I hope it becomes clearer now:
https://www.dropbox.com/s/3nr6vrrfwt...ditor.mp4?dl=0

Btw, the issue does not happen in the arrangement!
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Old 11-10-2017, 07:40 AM   #5
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Does this only happen when certain plugins are added to the project? If so, try to deactivate graphics acceleration in these plugins. As discussed elsewhere, incompatibility with the graphics driver may slow down the MIDI editor.
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Old 11-10-2017, 08:08 AM   #6
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This even happens with no plugins loaded at all.
I'm using a relatively new graphics card: Radeon RX 460 2GB RAM and with the latest drivers.
Is there anything else that I could try?
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Old 11-10-2017, 10:20 AM   #7
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I’m not sure I’ve seem this exact problem but I noticed a slight delay in Step input when Note Preview is on and the ASIO driver buffer is high (e.g. 512 samples vs 64 or 128).. would be interesting to know if either of those make any difference.. Finally, also check no other programs are running I’ve even seen Firefox introducing weird latency at the system level something like DPC Latency Checker can show up.

Last edited by Zamyen; 11-10-2017 at 10:29 AM.
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Old 11-10-2017, 12:58 PM   #8
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Haha, I sometimes forget that people can't necessarily detect sarcasm in text. When I said give us a bigger gif, I was sarcastically referring to how such a massive, embedded image makes the entire thread difficult to use. Sorry.

At any rate, I've seen another thread with people claiming the MIDI editor has become sluggish in recent versions so maybe it is a bug that can be fixed. I haven't noticed it yet though, so there are probably certain conditions to it.
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Old 11-10-2017, 02:11 PM   #9
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Ahhh, now that I opened the thread on the iPad, I know what you mean :-D Sorry

@Zamyen, I don't think it's an ASIO issue, my system runs rock solid on DPC lately checker.
But I will switch the latency to see if it makes a difference.
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Old 11-10-2017, 05:12 PM   #10
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I have just tested it on my Macbook, it does not happen there. What I noticed is: on my Windows machine, the CC lane description starts to flicker. I will also test how it behaves with no CC lanes active.
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Old 11-11-2017, 02:24 AM   #11
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Does this happen in all projects, or only one?

Does it depend on the number of MIDI events in the takes that are visible or editable in the editor?
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Old 11-11-2017, 03:49 AM   #12
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Okay, so:

- changing the latency has no effect
- removing cc lanes has no effect either

@Julian, it indeed happens in all projects, even empty ones with just one empty MIDI take (no MIDI notes or CCs). What's strange though, when I use the scroll bar at the bottom, to scroll thru the take, its absolutely fluent, as it should be.

Check the GIF below. When using the scroll hand mouse, the CC/velocity lane flickers. When using the scrollbars, it doesn't:

https://imgur.com/FZt5RPp
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