Pen/Tool Startup Lag on APh ver 1.7.0 (Mac)

[GarethuE8]

Hi,

I just downloaded the AP version 1.7 yesterday, and the first thing i noticed was when drawing with the brush tool is there is a noticeable lag at the start. When using any of the drawing tools, there seems to be a slow start or "un-recognition" at the start of the stroke. I use a Wacom tablet and initially thought it could be the tablet's fault, but this problem also applies when using my computer's mouse, so I doubt its tablet related. This problem exists whether I'm working on existing files or on new files

I use a MacBook Air 2017 model

MacOS Mojave ver 10.14.5

Enclosed is a video to show the "lag". Pay close attention to the cursor

Please help, it is really annoying!

[Callum]

Hi GarethuE8,

Welcome to the forums  

Please could you go to Affinity Photo > Preferences and send me a screenshot of the Performance tab?

Thanks

Callum 

[GarethuE8]

Hi Callum,

Here you go

 

[Callum]

Please could you try unticking the enable metal compute tick box then try setting the display dropdown to Open GL to see if this gives better performance?

[GarethuE8]

Wow! It worked. I unticked the box and used the Open GL option and the pen motions went back to being very fluid again!

I also wanted to point out that when I lowered the colour format of the file, it also got rid of some of the pen lag (I was previously using RGB/32 HDR), so I guess reducing the load of the document makes it less laggy (although this wasn't a problem in the last version)

Can I ask what exactly the reason behind the metal compute box and the Open GL things are and why they did what they did?

In any case, that you very much! 

[CuriousPuffin]

Hi,

I have the same lagging problem in Affinity Designer. I just purchased AD, so I have the latest version installed (1.8.3). I use a MacBook Air (2015) runs on Mojave (10.14.6). 1.6 GHZ i5, 8GB/1600 MHz/DDR3. 
I looked around this forum for a simmilar question. The problem stated by GarethuE8 seems close to mine. 
So I looked at my setting in AD and unticked the metal compute box. I set the dropdown to OpelGL. I set my document to web-RGB/8 en 72 dpi. But no change.

I also have an old version of Adobe Illustrator (CS5). When painting with brushes there there is no lag. So it's not the performance of my laptop so it seems.

I use a Wacom Bamboo, but also with just the MacBooks trackpad it has the same lag.

Any suggestions for me to try?