diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a8f8e24..328c7cb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -2,7 +2,7 @@ name: totp
 
 on:
   push:
-    branches: [ master ]
+    branches: [ '**' ]
   pull_request:
     branches: [ master ]
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 21eef57..67b7255 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,12 @@ add_executable(klib_project
     ${SOURCES} ${HEADERS}
 )
 
+# enable LTO
+target_compile_options(klib PUBLIC "-flto")
+target_compile_options(klib PUBLIC "-fuse-linker-plugin")
+target_link_options(klib PUBLIC "-flto")
+target_link_options(klib PUBLIC "-fuse-linker-plugin")
+
 # set the output filename
 set_target_properties(klib_project PROPERTIES OUTPUT_NAME "klib" SUFFIX ".elf")
 
diff --git a/ui/totp.hpp b/ui/totp.hpp
index 6218afb..03340f6 100644
--- a/ui/totp.hpp
+++ b/ui/totp.hpp
@@ -182,16 +182,23 @@ namespace menu {
                 totp_changed = true;
             }
 
-            // check if we should update the hashes
-            if ((Rtc::get() != last_epoch) || (last_interval != entries[current].interval)) {
-                // store the new epoch value
-                last_epoch = Rtc::get();
-
-                // get the runtime for the timing circle
-                last_epoch_runtime = klib::io::systick<>::get_runtime();
+            // get the rtc time
+            const auto time = Rtc::get();
 
-                // update the epoch buffer
-                klib::string::itoa(last_epoch.value, epoch_buf);
+            // check if we should update the hashes
+            if ((time != last_epoch) || (last_interval != entries[current].interval)) {
+                // only update the last epoch and runtime when the
+                // time has changed
+                if (time != last_epoch) {
+                    // store the new epoch value
+                    last_epoch = time;
+
+                    // get the runtime for the timing circle
+                    last_epoch_runtime = klib::io::systick<>::get_runtime();
+
+                    // update the epoch buffer
+                    klib::string::itoa(last_epoch.value, epoch_buf);
+                }
 
                 // update the seconds left in this cycle
                 klib::string::itoa(