diff --git a/recipes/core/base/recipe.toml b/recipes/core/base/recipe.toml
index a612115326..60f970a73b 100644
--- a/recipes/core/base/recipe.toml
+++ b/recipes/core/base/recipe.toml
@@ -160,11 +160,21 @@ esac
 mkdir -pv "${COOKBOOK_STAGE}/usr/bin" "${COOKBOOK_STAGE}/usr/lib/drivers"
 export CARGO_PROFILE_RELEASE_OPT_LEVEL=s
 export CARGO_PROFILE_RELEASE_PANIC=abort
-# Only build drivers that actually have source Cargo.toml entries
+# Only build drivers that actually have source Cargo.toml entries.
+# Collect the workspace's crate names ONCE from Cargo.toml files, skipping the
+# multi-GB target/ build trees. The previous code ran a full recursive grep of
+# the entire source (including target/, ~8.7 GB) for EVERY bin (~40 of them),
+# re-scanning gigabytes per entry — extremely slow. One scan + O(1) membership
+# lookup is equivalent and near-instant.
+declare -A HAVE_CRATE=()
+while IFS= read -r crate_name
+do
+    HAVE_CRATE["${crate_name}"]=1
+done < <(grep -Rhs --include=Cargo.toml --exclude-dir=target '^name = ' "${COOKBOOK_SOURCE}" | sed -E 's/^name = "([^"]+)".*/\\1/')
 EXISTING_BINS=()
 for bin in "${BINS[@]}"
 do
-    if grep -Rqs "^name = \\\"${bin}\\\"$" "${COOKBOOK_SOURCE}"; then
+    if [[ -n "${HAVE_CRATE[${bin}]:-}" ]]; then
         EXISTING_BINS+=("${bin}")
     fi
 done