Slow performance from tessellated solid and crashing in Scalar mode

The attached Geant4 application imports a medium sized tessellated model of about 300K facets. These are the results obtained on the following system:
   MacBook Pro (Retina, 15-inch, Mid 2015)
   Processor: 2.8 GHz Quad-Core Intel Core i7
   Memory: 16 GB 1600 MHz DDR3
   macOS Monterey 12.3, Apple clang 13.1.6
 
 (1) VecGeom, Vector backend (Native/avx2) - MT build:
 - Initialisation time: 29.3525 sec
 - Total time (exampleB1.in): 2200.512u 2.652s
 
 (2) VecGeom, Scalar backend - MT build:
 - Initialisation: 568.231 sec
 - Total time: crash with bus error at beamOn
 
 (3) Geant4 native - MT build:
 - Initialisation: 8.77866 sec
 - Total time (exampleB1.in): 19.255u 0.196s

To build/run the attached application:
cd B1/build
ln -s ../male.stl geometry.stl
./exampleB1 exampleB1.in