Avoid forking for identical markers

crates/uv-resolver/src/resolver/mod.rs

@@ -3302,6 +3302,21 @@ impl Forks {
                     }
                     continue;
                 }
+            } else {
+                // If all dependencies have the same markers, we should also avoid forking.
+                if let Some(dep) = deps.first() {
+                    let marker = dep.package.marker();
+                    if deps.iter().all(|dep| marker == dep.package.marker()) {
+                        for dep in deps {
+                            for fork in &mut forks {
+                                if fork.env.included_by_marker(marker) {
+                                    fork.add_dependency(dep.clone());
+                                }
+                            }
+                        }
+                        continue;
+                    }
+                }
             }
             for dep in deps {
                 let mut forker = match ForkingPossibility::new(env, &dep) {