  Searches for signals at low signal-to-noise ratios frequently involve the
Fast Fourier Transform (FFT). For high-throughput searches, we here consider
FFT on the homogeneous mesh of Processing Elements (PEs) of a wafer-scale
engine (WSE). To minimize memory overhead in the inherently non-local FFT
algorithm, we introduce a new synchronous slide operation ({\em Slide})
exploiting the fast interconnect between adjacent PEs. Feasibility of
compute-limited performance is demonstrated in linear scaling of Slide
execution times with varying array size in preliminary benchmarks on the CS-2
WSE. The proposed implementation appears opportune to accelerate and open the
full discovery potential of FFT-based signal processing in multi-messenger
astronomy.
