Fig. presents the cavity frequency dependence of k/k 0 . Here, the maximum suppression is achieved when ω c = ω Q . The VSC suppression effects are enlarged at a larger Ω R , because the peaks in J eff (ω) are farther away from the |ν L ⟩ → |ν ′ L ⟩ transition (as can be seen from Fig. ). This increase in Ω R also allows for light-matter interactions at larger cavity detuning, contributing to the broader rate profile. Our analytic FGR expression (Eq. 16) accurately captures the cavity frequency dependence of the rate constants for a wide range of Ω R . As such, k VSC in Eq. 16 has achieved a quantitative agreement with the HEOM simulation results and is capable of describing the sharp resonance behavior observed in the experiments .