5 ms·

Qt is slow now? All the Qt-based applications I've used are as fast as anything else can be.

by Sakos 4y ago

simonh 4y ago
From context it seems poster may believe Qt is some form of web framework, or something.
- antoineMoPa 4y ago
  Not sure why you believe that, I built some (small) Qt applications so I know it's not a web framework, I was just referring to slow software in general. I think it's less true now, but I remember KDE (Qt-based) being slower and buggier than gnome (Gtk-based) a couple of years ago, just to cite one thing. It just felt like Qt-based stuff was in general more of a pain to use & heavier than GTK based stuff. It's really a matter of personal preference here and Qt is a nice project, just that I have some criticism here regarding performance choices. I feel like bad performance decisions tend to snowball and get multiplied when people make library choices and add their own performance issues on top.
  - simonh 4y ago
    > Not sure why you believe that… Because you included it in a list that otherwise only contained web tech frameworks. It’s not clear to me why you think those are peers of Qt and implied to me that you think they are near equivalents.
  - int_19h 4y ago
    KDE apps tend to use KDE frameworks, which is quite a bit of stuff on top of what pure Qt offers. Pure Qt apps were always comparable to Gtk in performance.
  - kaba0 4y ago
    With all due respect, you made quite a strong claim based on very little proof/experience.
    - antoineMoPa 4y ago
      Yeah I agree, I don't have actual data to back this snowballing effect idea.
criddell 4y ago
AFAIK, Autodesk Fusion 360 is a Qt app and it's very slow compared to similar tools (like SolidWorks).
- cuteboy19 4y ago
  The actual processing is slow, not the UI
- inferiorhuman 4y ago
  Fusion is slow in large part because it makes a ton of HTTP requests. The Qt part is fairly performant.
- jrockway 4y ago
  Fusion 360 is kind of a mess that's gotten way out of control. I enjoy how the navigation cube can literally draw outside the boundaries of the window as you move the window around. I don't think that's a Qt problem, I think they glued ten different UI libraries together to keep their legacy code working.
  - inferiorhuman 4y ago
    Fusion is probably the newest software product that Autodesk rents. In fact it was Carl Bass' passion project. Unfortunately Autodesk's software development process is… broken.
- ravenstine 4y ago
  The fact that it's made by Autodesk is probably the reason that it's slow, not because it uses Qt. Various Autodesk products have been clunky, buggy, crashy, slow pieces of crap (I'm looking at you, Maya) since before they were migrated to Qt.
- dekhn 4y ago
  The UI is totally performant for me. The only time it's bogged down was when I was modelling something with > 100k mesh triangles. Or when I do a long UI-blocking processing operation (which isn't in the qt codepath)./
Kaze404 4y ago
Everything is slow when the goal is to just complain about things you don't understand.

Qt is slow now? All the Qt-based applications I've used are as fast as anything else can be.

by Sakos 4y ago

Qt is slow now? All the Qt-based applications I've used are as fast as anything else can be.

simonh 4y ago

From context it seems poster may believe Qt is some form of web framework, or something.

antoineMoPa 4y ago
Not sure why you believe that, I built some (small) Qt applications so I know it's not a web framework, I was just referring to slow software in general. I think it's less true now, but I remember KDE (Qt-based) being slower and buggier than gnome (Gtk-based) a couple of years ago, just to cite one thing. It just felt like Qt-based stuff was in general more of a pain to use & heavier than GTK based stuff. It's really a matter of personal preference here and Qt is a nice project, just that I have some criticism here regarding performance choices. I feel like bad performance decisions tend to snowball and get multiplied when people make library choices and add their own performance issues on top.
- simonh 4y ago
  > Not sure why you believe that… Because you included it in a list that otherwise only contained web tech frameworks. It’s not clear to me why you think those are peers of Qt and implied to me that you think they are near equivalents.
- int_19h 4y ago
  KDE apps tend to use KDE frameworks, which is quite a bit of stuff on top of what pure Qt offers. Pure Qt apps were always comparable to Gtk in performance.
- kaba0 4y ago
  With all due respect, you made quite a strong claim based on very little proof/experience.
  - antoineMoPa 4y ago
    Yeah I agree, I don't have actual data to back this snowballing effect idea.

criddell 4y ago

AFAIK, Autodesk Fusion 360 is a Qt app and it's very slow compared to similar tools (like SolidWorks).

cuteboy19 4y ago
The actual processing is slow, not the UI
inferiorhuman 4y ago
Fusion is slow in large part because it makes a ton of HTTP requests. The Qt part is fairly performant.
jrockway 4y ago
Fusion 360 is kind of a mess that's gotten way out of control. I enjoy how the navigation cube can literally draw outside the boundaries of the window as you move the window around. I don't think that's a Qt problem, I think they glued ten different UI libraries together to keep their legacy code working.
- inferiorhuman 4y ago
  Fusion is probably the newest software product that Autodesk rents. In fact it was Carl Bass' passion project. Unfortunately Autodesk's software development process is… broken.
ravenstine 4y ago
The fact that it's made by Autodesk is probably the reason that it's slow, not because it uses Qt. Various Autodesk products have been clunky, buggy, crashy, slow pieces of crap (I'm looking at you, Maya) since before they were migrated to Qt.
dekhn 4y ago
The UI is totally performant for me. The only time it's bogged down was when I was modelling something with > 100k mesh triangles. Or when I do a long UI-blocking processing operation (which isn't in the qt codepath)./

Kaze404 4y ago

Everything is slow when the goal is to just complain about things you don't understand.