diff --git a/.jules/bolt.md b/.jules/bolt.md
index 91f8c13..0c60552 100644
--- a/.jules/bolt.md
+++ b/.jules/bolt.md
@@ -12,3 +12,6 @@
 ## 2026-05-12 - [Remove Duplicate Static Initialization & Unsafe String Operations]
 **Learning:** The previous optimization attempt introduced a bug where 'cached_nodes' was initialized twice as different types (one array of xml_node pointers, one array of const char*). Moreover, directly casting const char* returned from pugixml without assigning to std::string when used in ternary operations can cause operand type mismatches.
 **Action:** Removed the redundant array initialization block and cast the char* obtained via `pt.text().get()` from the single cached xml_node array to `std::string` inside the ternary conditional to prevent implicit conversion mismatches.
+## 2026-05-27 - [String .append() in Repeated Method Calls]
+**Learning:** In the `zaman` class, `simdiki_zaman_turk` and the prayer times variables (`istibak_nucum`, `yatsi`, etc.) cause subtle memory leaks and unbounded string growth because they use `.append()` instead of assignment `=`. The constructor triggers the initialization, but if `sat_turk_v_d()` or `vkt_turk_v_d()` are called multiple times on the same object (e.g. updating the clock in a loop), the strings grow infinitely, allocating more memory and slowing down execution. Also, multiple `std::to_string` calls with `+` cause unnecessary heap allocations.
+**Action:** Always use direct assignment `=` to overwrite string state instead of `.append()` when updating object member fields that represent distinct states. Also use stack-based `char` arrays and `std::snprintf` for formatting short strings to prevent short-lived heap allocations.
diff --git a/src/src-class/Zaman.cpp b/src/src-class/Zaman.cpp
index d65d370..3b692a0 100644
--- a/src/src-class/Zaman.cpp
+++ b/src/src-class/Zaman.cpp
@@ -70,7 +70,9 @@ unsigned int zaman::vakt_to_td(const std::string& vakt)
 
 std::string zaman::td_to_vakt(unsigned int td)
 {
-	return std::to_string(int(td / 60) % 12) + ":" + std::to_string(int(td % 60));
+	char buffer[16];
+	std::snprintf(buffer, sizeof(buffer), "%d:%d", int(td / 60) % 12, int(td % 60));
+	return std::string(buffer);
 }
 
 void zaman::vkt_h_v_d()
@@ -111,16 +113,7 @@ void zaman::vkt_h_v_d()
 		return nodes;
 	}();
 
-	static const char* cached_nodes[400] = {nullptr};
-	static bool cached_nodes_init = []() {
-		for (pugi::xml_node pt = cached_sehir.child("prayertimes"); pt; pt = pt.next_sibling("prayertimes")) {
-			int day = std::atoi(pt.attribute("dayofyear").value());
-			if (day >= 0 && day < 400) cached_nodes[day] = pt.text().get();
-		}
-		return true;
-	}();
-
-	zaman::xml_bu_gun = (zaman::h_rakam_gun_senenin >= 0 && zaman::h_rakam_gun_senenin < 400 && cached_nodes[zaman::h_rakam_gun_senenin]) ? cached_nodes[zaman::h_rakam_gun_senenin] : "";
+	zaman::xml_bu_gun = (zaman::h_rakam_gun_senenin >= 0 && zaman::h_rakam_gun_senenin < 400 && cached_nodes[zaman::h_rakam_gun_senenin]) ? std::string(cached_nodes[zaman::h_rakam_gun_senenin].text().get()) : "";
 
 	zaman::h_aksam         = zaman::xml_bu_gun.substr(50, 6);
 	zaman::h_istibak_nucum = zaman::xml_bu_gun.substr(56, 6);
@@ -130,7 +123,7 @@ void zaman::vkt_h_v_d()
 	//buradaka kodları yeniliyoruz çünkü bir sonraki gün kılacağız verileri:
 
 	int next_day = zaman::h_rakam_gun_senenin + 1;
-	zaman::xml_bu_gun = (next_day >= 0 && next_day < 400 && cached_nodes[next_day]) ? cached_nodes[next_day] : "";
+	zaman::xml_bu_gun = (next_day >= 0 && next_day < 400 && cached_nodes[next_day]) ? std::string(cached_nodes[next_day].text().get()) : "";
 
 	zaman::h_imsak          = zaman::xml_bu_gun.substr(0, 4) ;
 	zaman::h_sabah          = zaman::xml_bu_gun.substr(5, 5) ;
@@ -177,19 +170,19 @@ void zaman::vkt_turk_v_d()
 	zaman::kible_saati_td   = (1440 - zaman::h_aksam_td) + zaman::h_kible_saati_td  ;
 
 	zaman::aksam = "00:00";
-	zaman::istibak_nucum.append( td_to_vakt(istibak_nucum_td) );
-	zaman::yatsi.append(         td_to_vakt(yatsi_td)         );
-	zaman::isa_sani.append(      td_to_vakt(isa_sani_td)      );
-	zaman::imsak.append(         td_to_vakt(imsak_td)         );
-	zaman::sabah.append(         td_to_vakt(sabah_td)         );
-	zaman::gunes.append(         td_to_vakt(gunes_td)         );
-	zaman::israk.append(         td_to_vakt(israk_td)         );
-	zaman::kerahet.append(       td_to_vakt(kerahet_td)       );
-	zaman::ogle.append(          td_to_vakt(ogle_td)          );
-	zaman::ikindi.append(        td_to_vakt(ikindi_td)        );
-	zaman::asr_sani.append(      td_to_vakt(asr_sani_td)      );
-	zaman::isfirar_sems.append(  td_to_vakt(isfirar_sems_td)  );
-	zaman::kible_saati.append(   td_to_vakt(kible_saati_td)   );
+	zaman::istibak_nucum = td_to_vakt(istibak_nucum_td);
+	zaman::yatsi         = td_to_vakt(yatsi_td)        ;
+	zaman::isa_sani      = td_to_vakt(isa_sani_td)     ;
+	zaman::imsak         = td_to_vakt(imsak_td)        ;
+	zaman::sabah         = td_to_vakt(sabah_td)        ;
+	zaman::gunes         = td_to_vakt(gunes_td)        ;
+	zaman::israk         = td_to_vakt(israk_td)        ;
+	zaman::kerahet       = td_to_vakt(kerahet_td)      ;
+	zaman::ogle          = td_to_vakt(ogle_td)         ;
+	zaman::ikindi        = td_to_vakt(ikindi_td)       ;
+	zaman::asr_sani      = td_to_vakt(asr_sani_td)     ;
+	zaman::isfirar_sems  = td_to_vakt(isfirar_sems_td) ;
+	zaman::kible_saati   = td_to_vakt(kible_saati_td)  ;
 
 };
 
@@ -208,7 +201,9 @@ void zaman::sat_turk_v_d()
 	zaman::dakika    =  int((  zaman::zaman_td   / 60) % 60 )      ;
 	zaman::saniye    =  int((  zaman::zaman_td ) % 60)             ;
 
-	zaman::simdiki_zaman_turk.append(std::to_string(zaman::saat)    + ":" +   std::to_string(zaman::dakika)   + ":" +   std::to_string(zaman::saniye));
+	char buffer[24];
+	std::snprintf(buffer, sizeof(buffer), "%d:%d:%d", zaman::saat, zaman::dakika, zaman::saniye);
+	zaman::simdiki_zaman_turk = std::string(buffer);
 
 };