diff --git a/src/fast_cal/fast_cal.cc b/src/fast_cal/fast_cal.cc
index 71dffa2..269f78a 100644
--- a/src/fast_cal/fast_cal.cc
+++ b/src/fast_cal/fast_cal.cc
@@ -59,6 +59,11 @@ void FastCal::fast_cal(uint64_t code) {
 //    };
 //    cache.emplace(&cases[code]);
 
+//    cases.reserve(30000);
+    cases.reserve(65536);
+//    cases.reserve(65536 * 2);
+//    cases.reserve(65536 * 4);
+
     cache.emplace(&cases.emplace(code, fast_cal_t {
         .code = code,
         .mask = 0,
diff --git a/src/main.cc b/src/main.cc
index f077aec..f98c3bd 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -11,6 +11,7 @@
 
 #include <thread>
 #include <algorithm>
+#include <unistd.h>
 
 //void get_status() {
 //    switch (BasicRanges::status()) {
@@ -215,5 +216,7 @@ int main() {
     std::cout << (clock() - start_time) * 1000000 / CLOCKS_PER_SEC << "us" << std::endl;
 //    std::cout << "complete benchmark" << std::endl;
 
+//    pause();
+
     return 0;
 }