diff --git a/api/index.js b/api/index.js
index 9acd039..cc192cb 100644
--- a/api/index.js
+++ b/api/index.js
@@ -4500,15 +4500,30 @@ function updateStatsFromCpuMonitoringEvent(monitoringData) {
             updateStatsCell('memory-usage', monitoringData.memory_usage_mb.toFixed(1) + ' MB');
         }
 
+        // MEM% bar using memory_percent from server
+        if (monitoringData.memory_percent !== undefined) {
+            const memPct = Math.min(100, Math.max(0, monitoringData.memory_percent));
+            updateStatsCell('memory-usage', monitoringData.memory_usage_mb.toFixed(1) + ' MB  ' + makeAsciiBar(memPct));
+        }
+
         if (monitoringData.current_cpu_core !== undefined) {
             updateStatsCell('cpu-core', 'Core ' + monitoringData.current_cpu_core);
         }
 
-        // Calculate CPU usage percentage if we have the data
+        // CPU% using delta between samples
         if (monitoringData.process_cpu_time !== undefined && monitoringData.system_cpu_time !== undefined) {
-            // For now, just show the raw process CPU time (simplified)
-            // In a real implementation, you'd calculate deltas over time
-            updateStatsCell('cpu-usage', monitoringData.process_cpu_time + ' ticks');
+            if (window._prevCpuSample) {
+                const procDelta = monitoringData.process_cpu_time - window._prevCpuSample.proc;
+                const sysDelta = monitoringData.system_cpu_time - window._prevCpuSample.sys;
+                if (sysDelta > 0) {
+                    const cpuPct = Math.min(100, Math.max(0, (procDelta / sysDelta) * 100));
+                    updateStatsCell('cpu-usage', makeAsciiBar(cpuPct));
+                }
+            }
+            window._prevCpuSample = {
+                proc: monitoringData.process_cpu_time,
+                sys: monitoringData.system_cpu_time
+            };
         }
 
     } catch (error) {
@@ -4898,6 +4913,13 @@ function formatTimestamp(timestamp) {
     return date.toLocaleString();
 }
 
+// Generate ASCII progress bar: [###############.....] 75%
+function makeAsciiBar(pct) {
+    const filled = Math.round(pct / 5); // 20 chars = 100%
+    const empty = 20 - filled;
+    return '[' + '#'.repeat(filled) + '.'.repeat(empty) + '] ' + pct.toFixed(1) + '%';
+}
+
 // Update statistics cell with flash animation if value changed
 function updateStatsCell(cellId, newValue) {
     const cell = document.getElementById(cellId);
diff --git a/relay.pid b/relay.pid
index 84bc9e5..218a2ab 100644
--- a/relay.pid
+++ b/relay.pid
@@ -1 +1 @@
-2380224
+2388377
diff --git a/src/api.c b/src/api.c
index e088cb2..bfee576 100644
--- a/src/api.c
+++ b/src/api.c
@@ -1295,13 +1295,13 @@ cJSON* query_cpu_metrics(void) {
     // Get active WebSocket connection count
     cJSON_AddNumberToObject(cpu_stats, "active_connections", (double)get_active_connection_count());
 
-    // Get memory usage from /proc/self/status
+    // Get memory usage from /proc/self/status and calculate MEM%
+    unsigned long rss_kb = 0;
     FILE* mem_stat = fopen("/proc/self/status", "r");
     if (mem_stat) {
         char line[256];
         while (fgets(line, sizeof(line), mem_stat)) {
             if (strncmp(line, "VmRSS:", 6) == 0) {
-                unsigned long rss_kb;
                 if (sscanf(line, "VmRSS: %lu kB", &rss_kb) == 1) {
                     double rss_mb = rss_kb / 1024.0;
                     cJSON_AddNumberToObject(cpu_stats, "memory_usage_mb", rss_mb);
@@ -1312,6 +1312,25 @@ cJSON* query_cpu_metrics(void) {
         fclose(mem_stat);
     }
 
+    // Get total system memory from /proc/meminfo for MEM%
+    if (rss_kb > 0) {
+        FILE* meminfo = fopen("/proc/meminfo", "r");
+        if (meminfo) {
+            char line[256];
+            while (fgets(line, sizeof(line), meminfo)) {
+                if (strncmp(line, "MemTotal:", 9) == 0) {
+                    unsigned long total_kb;
+                    if (sscanf(line, "MemTotal: %lu kB", &total_kb) == 1 && total_kb > 0) {
+                        double mem_pct = (rss_kb * 100.0) / total_kb;
+                        cJSON_AddNumberToObject(cpu_stats, "memory_percent", mem_pct);
+                    }
+                    break;
+                }
+            }
+            fclose(meminfo);
+        }
+    }
+
     return cpu_stats;
 }
 
diff --git a/src/main.h b/src/main.h
index 9276b0d..1f4612b 100644
--- a/src/main.h
+++ b/src/main.h
@@ -13,8 +13,8 @@
 // Using CRELAY_ prefix to avoid conflicts with nostr_core_lib VERSION macros
 #define CRELAY_VERSION_MAJOR 1
 #define CRELAY_VERSION_MINOR 2
-#define CRELAY_VERSION_PATCH 47
-#define CRELAY_VERSION "v1.2.47"
+#define CRELAY_VERSION_PATCH 48
+#define CRELAY_VERSION "v1.2.48"
 
 // Relay metadata (authoritative source for NIP-11 information)
 #define RELAY_NAME "C-Relay"