diff --git a/invokeai/backend/model_manager/util/libc_util.py b/invokeai/backend/model_manager/util/libc_util.py
index 8d104093085..61649532811 100644
--- a/invokeai/backend/model_manager/util/libc_util.py
+++ b/invokeai/backend/model_manager/util/libc_util.py
@@ -36,23 +36,35 @@ class Struct_mallinfo2(ctypes.Structure):
     ]
 
     def __str__(self) -> str:
-        s = ""
-        s += (
-            f"{'arena': <10}= {(self.arena / 2**30):15.5f}   # Non-mmapped space allocated (GB) (uordblks + fordblks)\n"
-        )
-        s += f"{'ordblks': <10}= {(self.ordblks): >15}   # Number of free chunks\n"
-        s += f"{'smblks': <10}= {(self.smblks): >15}   # Number of free fastbin blocks \n"
-        s += f"{'hblks': <10}= {(self.hblks): >15}   # Number of mmapped regions \n"
-        s += f"{'hblkhd': <10}= {(self.hblkhd / 2**30):15.5f}   # Space allocated in mmapped regions (GB)\n"
-        s += f"{'usmblks': <10}= {(self.usmblks): >15}   # Unused\n"
-        s += f"{'fsmblks': <10}= {(self.fsmblks / 2**30):15.5f}   # Space in freed fastbin blocks (GB)\n"
-        s += (
-            f"{'uordblks': <10}= {(self.uordblks / 2**30):15.5f}   # Space used by in-use allocations (non-mmapped)"
-            " (GB)\n"
-        )
-        s += f"{'fordblks': <10}= {(self.fordblks / 2**30):15.5f}   # Space in free blocks (non-mmapped) (GB)\n"
-        s += f"{'keepcost': <10}= {(self.keepcost / 2**30):15.5f}   # Top-most, releasable space (GB)\n"
-        return s
+        # Precompute divisor
+        GB = 2**30
+
+        # Avoid repeated attribute and division lookups
+        arena_gb = self.arena / GB
+        ordblks = self.ordblks
+        smblks = self.smblks
+        hblks = self.hblks
+        hblkhd_gb = self.hblkhd / GB
+        usmblks = self.usmblks
+        fsmblks_gb = self.fsmblks / GB
+        uordblks_gb = self.uordblks / GB
+        fordblks_gb = self.fordblks / GB
+        keepcost_gb = self.keepcost / GB
+
+        # List of strings, join at the end for efficiency
+        lines = [
+            f"{'arena': <10}= {arena_gb:15.5f}   # Non-mmapped space allocated (GB) (uordblks + fordblks)\n",
+            f"{'ordblks': <10}= {ordblks: >15}   # Number of free chunks\n",
+            f"{'smblks': <10}= {smblks: >15}   # Number of free fastbin blocks \n",
+            f"{'hblks': <10}= {hblks: >15}   # Number of mmapped regions \n",
+            f"{'hblkhd': <10}= {hblkhd_gb:15.5f}   # Space allocated in mmapped regions (GB)\n",
+            f"{'usmblks': <10}= {usmblks: >15}   # Unused\n",
+            f"{'fsmblks': <10}= {fsmblks_gb:15.5f}   # Space in freed fastbin blocks (GB)\n",
+            (f"{'uordblks': <10}= {uordblks_gb:15.5f}   # Space used by in-use allocations (non-mmapped) (GB)\n"),
+            f"{'fordblks': <10}= {fordblks_gb:15.5f}   # Space in free blocks (non-mmapped) (GB)\n",
+            f"{'keepcost': <10}= {keepcost_gb:15.5f}   # Top-most, releasable space (GB)\n",
+        ]
+        return "".join(lines)
 
 
 class LibcUtil: