doesn't say how to contribute
Your results are very iffy vs. local runs here.  By that I don't mean the run times as I am using 24T on a different CPU (Ryzen 7th gen);
but intra results on these so called program test results.

Anyway, spectral-norm, 1.d , for multi threading, a simple edit on a line should make it MT 1-m.d:
(fs, don't even know how to make quoted code here :p)

```
--- 1.d.orig	2025-03-24 09:45:54.198352668 +0100
+++ 1.d	2025-03-24 09:47:15.757138282 +0100
@@ -34,7 +34,7 @@
 
 void times(double[] v, double[] u, int n, bool reverse)
 {
-    for (auto i = 0; i < n; i++)
+    foreach(i;parallel(iota(n)))
     {
         auto sum = 0.0;
         for (auto j = 0; j < n; j++)

```

times here for 8000: 

c++ im = 158-160ms
c m = 160-162ms
d m = 236ms (+50%)

I know from experience this can be brought down into about 200ms most likely, but then again, changing just one line says somehting about production time vs. runtime :) over far more complex changes in said other languages.
