diff --git a/src/ui/windows/mining_earnings.cpp b/src/ui/windows/mining_earnings.cpp
index 94f1d4e..186f23c 100644
--- a/src/ui/windows/mining_earnings.cpp
+++ b/src/ui/windows/mining_earnings.cpp
@@ -307,9 +307,20 @@ void RenderMiningEarnings(App* app, const WalletState& state, const MiningInfo&
 
         // ---- Memory bar — centered in remaining space below details ----
         {
-            double totalRAM  = dragonx::util::Platform::getTotalSystemRAM_MB();
-            double usedRAM   = dragonx::util::Platform::getUsedSystemRAM_MB();
-            double selfRAM   = dragonx::util::Platform::getSelfMemoryUsageMB();
+            double totalRAM  = dragonx::util::Platform::getTotalSystemRAM_MB();   // cached inside Platform
+            // Used/self RAM are synchronous OS reads (/proc/meminfo + /proc/self/status on Linux): sample them at
+            // most once a second, not every frame. The first frame after >1 s idle resamples immediately.
+            static double s_usedRAM = 0.0, s_selfRAM = 0.0;
+            static int64_t s_ramSampledMs = 0;
+            static bool s_ramSampled = false;
+            if (!s_ramSampled || IntervalElapsed(nowMs, s_ramSampledMs, 1000)) {
+                s_usedRAM = dragonx::util::Platform::getUsedSystemRAM_MB();
+                s_selfRAM = dragonx::util::Platform::getSelfMemoryUsageMB();
+                s_ramSampledMs = nowMs;
+                s_ramSampled = true;
+            }
+            double usedRAM   = s_usedRAM;
+            double selfRAM   = s_selfRAM;
             double daemonRAM = app->getDaemonMemoryUsageMB();
             // Include xmrig memory when pool mining
             double xmrigRAM  = state.pool_mining.memory_used / (1024.0 * 1024.0); // bytes -> MB