<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi,<div><br><div>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?<br><br><div dir="ltr">Nicolas Cadieux</div><div dir="ltr"><br><blockquote type="cite">Le 9 janv. 2020 à 18:21, Alexandre Neto <senhor.neto@gmail.com> a écrit :<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="auto"><div dir="auto">Hi Peter,</div><div dir="auto"><br></div>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.<div dir="auto"><br></div><div dir="auto">Hope it helps,</div><div dir="auto"><br></div><div dir="auto">Alexandre Neto</div><div dir="auto">QGIS Support</div><div dir="auto"><a href="https://smex-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.QCooperative.net&umid=78acbac1-d0a0-4165-8391-f7bc9498c22c&auth=bf81fa88bf46c441e3fa0c29e31e35617988196f-aeddc0339af5f50edc3ba0398521cba4a48bd09f">www.QCooperative.net</a></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">A quinta, 9/01/2020, 20:42, Peter Cornelissen <<a href="mailto:peter@cornelissen.org.uk">peter@cornelissen.org.uk</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<span>Hi</span></div>
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<span>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.</span></div>
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<span>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.</span></div>
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<span>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?</span></div>
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<span>Thought?</span></div>
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<span>Peter</span></div>
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