it depends on the knot, but testing has shown most knots will slide at abysmally low loads (like 10-15% of line strength), and some rare knots will hold, but will fail at much lower loads than expected on "normal" rope (for instance if memory serves me, a decent knot like the figure 8 loop, which is expected to maintain around 80% line strength, will fail under 50% in dyneema, more like 30%).
there's really hardly any point in using dyneema rope if not splicing, and splicing some simple fixed loops is really really easy. i hesitated to "leran splicing" too, for way too long, it's really easy with this kind of rope: 5 minutes maybe to read some instructions or watch a video, and a piece of bent wire, is all it takes.
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