diff --git a/src/spark_effect.cc b/src/spark_effect.cc
index 79f0863..b747e3b 100644
--- a/src/spark_effect.cc
+++ b/src/spark_effect.cc
@@ -7,6 +7,8 @@
 SparkEffect::SparkEffect(int count, float lifetime, Vector3 pos,
                          float pos_xz_variance, float radius)
     : sparks(), lifetime(lifetime), timer(0.0F) {
+  sparks.reserve(count);
+
   Vector3 above_pos = pos;
   above_pos.y += radius;
   for (; count > 0; --count) {
diff --git a/src/spark_effect.h b/src/spark_effect.h
index 3746d69..0dde24a 100644
--- a/src/spark_effect.h
+++ b/src/spark_effect.h
@@ -10,7 +10,7 @@
 constexpr float SPARK_RADIUS = 0.03F;
 constexpr float SPARK_VEL_RATE = 5.0F;
 constexpr float SPARK_VEL_VARIANCE = 1.0F;
-constexpr float SPARK_ACC_RATE = 10.0F;
+constexpr float SPARK_ACC_RATE = 8.0F;
 
 class SparkEffect {
  public: