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Tracer diffusion of Co, Cr, Fe and Ni is measured at 1373 K in Co₂₀Cr₂₀Fe₂₀Mn₂₀Ni₂₀, Co₁₀Cr₁₀Fe₁₀Mn₁₀Ni₆₀ and Co₂Cr₂Fe₂Mn₂Ni₉₂ alloys. Diffusion retardation in the high-entropy Co₂₀Cr₂₀Fe₂₀Mn₂₀Ni₂₀ alloy is most prominent in comparison to the Co₂Cr₂Fe₂Mn₂Ni₉₂ solid solution, however the concept of ‘sluggish’ diffusion cannot be used as a blanket statement. The tracer diffusion coefficient drops either slightly (by a factor of three, Fe) or marginally (by a factor of 1.2, Ni) if compared at 1373 K. Alternatively, if compared on a homologous temperature scale, the diffusion retardation can be as large as a factor of 30 (Fe) or 10 (Ni).