[Qgis-user] QGIS slows PC to a point it is unusable

Fri Jan 10 07:54:53 PST 2020

Hi Harrissou & Bernhard

I have just seen that note. I will give it a try when I get a chance, it’s an easy thing to try.

Thanks, Peter

________________________________
From: DelazJ <delazj at gmail.com>
Sent: Friday, January 10, 2020 3:51:58 PM
To: Peter Cornelissen <peter at cornelissen.org.uk>
Cc: Nicolas Cadieux <nicolas.cadieux at archeotec.ca>; QGIS User <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] QGIS slows PC to a point it is unusable

Hi Peter,

Bernhard earlier suggested to run QGIS under a new user profile without any third party plugins, because some plugins used to slow down QGIs due to wrong memory management. Might be worth giving a shot if you didn't yet?

Regards,
Harrissou

Le ven. 10 janv. 2020 à 16:45, Peter Cornelissen <peter at cornelissen.org.uk<mailto:peter at cornelissen.org.uk>> a écrit :
HI Nicolas

Thanks. I'm not happy about messing with the bios though, I think I'll leave that and consider a new laptop with more memory. I'll see how it goes using GeoPackage to startw thi and take it from there.

Peter
________________________________
From: Nicolas Cadieux <nicolas.cadieux at archeotec.ca<mailto:nicolas.cadieux at archeotec.ca>>
Sent: 10 January 2020 12:42
To: Peter Cornelissen <peter at cornelissen.org.uk<mailto:peter at cornelissen.org.uk>>
Cc: Alexandre Neto <senhor.neto at gmail.com<mailto:senhor.neto at gmail.com>>; QGIS User <qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>>
Subject: Re: [Qgis-user] QGIS slows PC to a point it is unusable

Hi,

Try going into the computer bios. Perhaps you can reduce the memory allocation for the video card.  Nice to know GeoPackage option seems to help.

Nicolas Cadieux

Le 10 janv. 2020 à 03:01, Peter Cornelissen <peter at cornelissen.org.uk<mailto:peter at cornelissen.org.uk>> a écrit :

Sorry I meant to say that the memory IS the problem!!

On 10 Jan 2020 07:58, peter at cornelissen.org.uk<mailto:peter at cornelissen.org.uk> wrote:
Hi guy

Thanks for the feedback. I've checked and as my PC slows down it reaches the point where QGIS is using 79% of the memory, so there's no problem. Unfortunately there's not much I can do about it as it is a laptop and is already at its maximum of 8GB and is using 1.8GB for the video. I'll rebuild using Geo Packages as that seems like the way forward. I can't really make use of PostGIS as I need to port to QField.

Peter

On 9 Jan 2020 23:54, Nicolas Cadieux <nicolas.cadieux at archeotec.ca<mailto:nicolas.cadieux at archeotec.ca>> wrote:
Hi,

You are likely running out of memory.  Do a control-alt-delete and look at the memory usage.  Look at the memory, disk and cpu usage before starting QGIS and once the project is loaded and working.  Turn off unwanted plugins.  Make sure you don’t have a virus or some background process using your cpus. You should probably have 8 to 16 GB of memory.  Is this a laptop?  Is the laptop sharing the video memory with the system memory?

Nicolas Cadieux

Le 9 janv. 2020 à 18:21, Alexandre Neto <senhor.neto at gmail.com<mailto:senhor.neto at gmail.com>> a écrit :

Hi Peter,

Try to use Spatialite, Geopackage or (even better) PostGIS to store your data and create indexes both on the geometries, but also on the fields used on the rules you mentioned. That can give you a nice boost.

Hope it helps,

Alexandre Neto
QGIS Support
www.QCooperative.net<https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsmex-ctp.trendmicro.com%3A443%2Fwis%2Fclicktime%2Fv1%2Fquery%3Furl%3Dhttp%253a%252f%252fwww.QCooperative.net%26umid%3D78acbac1-d0a0-4165-8391-f7bc9498c22c%26auth%3Dbf81fa88bf46c441e3fa0c29e31e35617988196f-aeddc0339af5f50edc3ba0398521cba4a48bd09f&data=02%7C01%7C%7Cd1185a22aef349e288e708d795e50e91%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637142683345671142&sdata=Uyx3B3aPJx2f9vOku0h6Xvs3bu3IoZZIrgsokc1tZDg%3D&reserved=0>

A quinta, 9/01/2020, 20:42, Peter Cornelissen <peter at cornelissen.org.uk<mailto:peter at cornelissen.org.uk>> escreveu:
Hi

I am finding that although my ShapeFIle tables in QGIS are not huge, my Windows 10 PC virtually comes to a grinding halt and becomes unusable once I get to something like 50 layers. I am using about 6 or 7 ShapeFiles with different filters. I think it is related to the fact that approx. most of them having a rule based styles, some with about 20 rules per layer.

Restarting the PC sorts things out for a while, but soon as I start working on the project it quickly gets slower and again comes to a point where it again slows right down.

I've not seen anything relate to this issue online and I've seen tables which must be huge. Is it likely to be my PC or am I using the wrong methods? Would I be better using SpatiaLite to store the tables?

Thought?

Peter
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