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Most commonly the "Fireflies" show up where we have small light sources, glossy materials or very bright HDRIs. These set-ups create highlights in the reflections that have higher pixel values than the rest of the image. From the image I can suggest trying the following:
enable the denoiser in the Render setup dialog,
increase the render samples in the Render setup dialog,
lower the Clamp secondary rays value in the Render tab>Advanced rollout.
Please let me know if any of the suggestions fixes it.
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