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 <[email protected]> a 
> écrit :
> 
> 
> Sorry I meant to say that the memory IS the problem!!
> 
> On 10 Jan 2020 07:58, [email protected] 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 <[email protected]> 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 <[email protected]> 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
> 
> A quinta, 9/01/2020, 20:42, Peter Cornelissen <[email protected]> 
> 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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