diff --git a/tiny_obj_loader.h b/tiny_obj_loader.h
index 2276adc..b62321b 100644
--- a/tiny_obj_loader.h
+++ b/tiny_obj_loader.h
@@ -418,8 +418,21 @@ static bool tryParseDouble(const char *s, const char *s_end, double *result) {
     read = 1;
     end_not_reached = (curr != s_end);
     while (end_not_reached && IS_DIGIT(*curr)) {
+      static const double pow_lut[] = {
+        1.0,
+        0.1,
+        0.01,
+        0.001,
+        0.0001,
+        0.00001,
+        0.000001,
+        0.0000001,
+      };
+      const int lut_entries = sizeof pow_lut / sizeof pow_lut[0];
+
       // NOTE: Don't use powf here, it will absolutely murder precision.
-      mantissa += static_cast<int>(*curr - 0x30) * pow(10.0, -read);
+      mantissa += static_cast<int>(*curr - 0x30) *
+        (read < lut_entries ? pow_lut[read] : pow(10.0, -read));
       read++;
       curr++;
       end_not_reached = (curr != s_end);
@@ -459,8 +472,8 @@ static bool tryParseDouble(const char *s, const char *s_end, double *result) {
   }
 
 assemble:
-  *result =
-      (sign == '+' ? 1 : -1) * ldexp(mantissa * pow(5.0, exponent), exponent);
+  *result = (sign == '+' ? 1 : -1) *
+    (exponent ? ldexp(mantissa * pow(5.0, exponent), exponent) : mantissa);
   return true;
 fail:
   return false;
@@ -692,9 +705,8 @@ void LoadMtl(std::map<std::string, int> *material_map,
   material_t material;
   InitMaterial(&material);
 
+  std::string linebuf;
   while (inStream->peek() != -1) {
-    std::string linebuf;
-
     safeGetline(*inStream, linebuf);
 
     // Trim trailing whitespace.
@@ -1090,8 +1102,8 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
 
   shape_t shape;
 
+  std::string linebuf;
   while (inStream->peek() != -1) {
-    std::string linebuf;
     safeGetline(*inStream, linebuf);
 
     // Trim newline '\r\n' or '\n'