diff --git a/fuzzers/.gitignore b/fuzzers/.gitignore
new file mode 100644
index 00000000..01a18a08
--- /dev/null
+++ b/fuzzers/.gitignore
@@ -0,0 +1,2 @@
+timing3.csv
+timing3.txt
diff --git a/fuzzers/007-timing/test_zero/README.md b/fuzzers/007-timing/test_zero/README.md
new file mode 100644
index 00000000..ef5ea1e4
--- /dev/null
+++ b/fuzzers/007-timing/test_zero/README.md
@@ -0,0 +1 @@
+Collect info on ZERO speed classes
diff --git a/fuzzers/007-timing/test_zero/process.py b/fuzzers/007-timing/test_zero/process.py
new file mode 100644
index 00000000..21d322eb
--- /dev/null
+++ b/fuzzers/007-timing/test_zero/process.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+
+import sys
+import os
+import time
+import json
+
+
+def run_types(tilej, verbose=False):
+
+    def process(etype):
+        # dict[model] = set((tile, wire/pip))
+        zeros = {}
+        print('Processing %s' % etype)
+        # Index delay models by type, recording where they occured
+        for tilek, tilev in tilej['tiles'].items():
+            for ename, emodel in tilev[etype].items():
+                if emodel.find('ZERO') >= 0:
+                    zeros.setdefault(emodel, set()).add((tilek, ename))
+        # Print out delay model instances
+        print('%s ZERO types: %u, %s' % (etype, len(zeros), zeros.keys()))
+        print('%s ZERO instances: %u' % (etype, sum([len(x) for x in zeros.values()])))
+        for model in sorted(zeros.keys()):
+            modelv = zeros[model]
+            print('Model: %s' % model)
+            for tile_name, element_name in sorted(list(modelv)):
+                print('  %s: %s' % (tile_name, element_name))
+
+    process('wires')
+    print('')
+    process('pips')
+
+def run_prefix(tilej, verbose=False):
+
+    def process(etype):
+        prefixes = set()
+        print('Processing %s' % etype)
+        # Index delay models by type, recording where they occured
+        for tilek, tilev in tilej['tiles'].items():
+            for ename, emodel in tilev[etype].items():
+                prefix = emodel.split('_')[0]
+                prefixes.add(prefix)
+        print('%s prefixes: %u' % (etype, len(prefixes)))
+        for prefix in sorted(prefixes):
+            print('  %s' % prefix)
+
+    process('wires')
+    print('')
+    process('pips')
+
+def run(fnin, verbose=False):
+    tilej = json.load((open(fnin, 'r')))
+    run_types(tilej)
+    print('')
+    print('')
+    run_prefix(tilej)
+
+def main():
+    import argparse
+
+    parser = argparse.ArgumentParser(description='Solve timing solution')
+    parser.add_argument('fnin', default="../timgrid/build/timgrid-s.json", nargs='?', help='input timgrid JSON')
+    args = parser.parse_args()
+
+    run(args.fnin, verbose=False)
+
+
+if __name__ == '__main__':
+    main()