diff --git a/health_functions.sql b/health_functions.sql
index 603affa..ca34632 100644
--- a/health_functions.sql
+++ b/health_functions.sql
@@ -37,7 +37,30 @@ $$ LANGUAGE plpgsql;
 
 CREATE OR REPLACE FUNCTION public.c77_dbh_get_mv_details(p_mv_name text)
     RETURNS JSON AS $$
+DECLARE
+    v_io_load numeric;  -- Estimated I/O rate (blocks/sec)
+    v_cpu_wait boolean; -- True if waiting on CPU
+    v_mem_pressure numeric; -- Buffer hit ratio (lower = more memory pressure)
 BEGIN
+    -- Calculate system stats
+    SELECT
+        (d.blks_read + d.blks_hit) / EXTRACT(EPOCH FROM (NOW() - d.stats_reset)) AS io_load,
+        EXISTS (
+            SELECT 1
+            FROM pg_stat_activity
+            WHERE query ILIKE '%REFRESH MATERIALIZED VIEW%'
+              AND wait_event_type = 'CPU'
+              AND state = 'active'
+        ) AS cpu_wait,
+        CASE
+            WHEN b.buffers_clean + b.buffers_backend = 0 THEN 1.0
+            ELSE b.buffers_clean::numeric / (b.buffers_clean + b.buffers_backend)
+            END AS mem_pressure
+    INTO v_io_load, v_cpu_wait, v_mem_pressure
+    FROM pg_stat_database d
+             CROSS JOIN pg_stat_bgwriter b
+    WHERE d.datname = current_database();
+
     RETURN (
         SELECT json_build_object(
                        'metric', 'Materialized View Refresh',
@@ -53,15 +76,15 @@ BEGIN
                                        ELSE 1
                            END,
                        'insight', CASE
-                                      WHEN io_rate > 50 THEN 'Refreshes are slower due to high I/O load.'
-                                      WHEN cpu_usage > 80 THEN 'Refreshes are slower due to high CPU usage.'
-                                      WHEN ram_usage > 90 THEN 'Refreshes are slower due to memory constraints.'
+                                      WHEN v_io_load > 1000 THEN 'Refreshes are slower due to high I/O load.'
+                                      WHEN v_cpu_wait THEN 'Refreshes are slower due to CPU contention.'
+                                      WHEN v_mem_pressure < 0.9 THEN 'Refreshes are slower due to memory pressure.'
                                       ELSE 'Refreshes are performing normally.'
                            END,
                        'action', CASE
-                                     WHEN io_rate > 50 THEN 'Optimize I/O or schedule during off-peak hours.'
-                                     WHEN cpu_usage > 80 THEN 'Increase CPU capacity or optimize queries.'
-                                     WHEN ram_usage > 90 THEN 'Adjust memory settings (e.g., work_mem).'
+                                     WHEN v_io_load > 1000 THEN 'Optimize I/O or schedule during off-peak hours.'
+                                     WHEN v_cpu_wait THEN 'Increase CPU capacity or reduce concurrent load.'
+                                     WHEN v_mem_pressure < 0.9 THEN 'Adjust memory settings (e.g., shared_buffers).'
                                      ELSE 'No action needed.'
                            END,
                        'details', json_build_object(
@@ -70,28 +93,24 @@ BEGIN
                                'min_refresh_time', refresh_mv_time_min::text,
                                'max_refresh_time', refresh_mv_time_max::text,
                                'refresh_count', refresh_count,
-                               'cpu_usage', cpu_usage::text || '%',
-                               'ram_usage', ram_usage::text || '%',
-                               'io_rate', io_rate::text || ' MB/s',
+                               'io_load', round(v_io_load)::text || ' blocks/sec',
+                               'cpu_waiting', v_cpu_wait::text,
+                               'buffer_hit_ratio', round(v_mem_pressure * 100)::text || '%',
                                'bottleneck', CASE
-                                                 WHEN io_rate > 50 THEN 'I/O'
-                                                 WHEN cpu_usage > 80 THEN 'CPU'
-                                                 WHEN ram_usage > 90 THEN 'RAM'
+                                                 WHEN v_io_load > 1000 THEN 'I/O'
+                                                 WHEN v_cpu_wait THEN 'CPU'
+                                                 WHEN v_mem_pressure < 0.9 THEN 'RAM'
                                                  ELSE 'None'
                                    END,
                                'explanations', json_build_object(
                                        'last_refresh_time', 'Last refresh duration compared to historical min/max.',
-                                       'io_rate', 'High I/O rate indicates disk operations are limiting performance.',
-                                       'cpu_usage', 'High CPU usage suggests processing power is the bottleneck.',
-                                       'ram_usage', 'High memory usage may cause disk spills, slowing refreshes.'
+                                       'io_load', 'High I/O load (blocks/sec) indicates disk operations are limiting performance.',
+                                       'cpu_waiting', 'True if the refresh is waiting on CPU resources.',
+                                       'buffer_hit_ratio', 'Lower ratio means more disk access due to memory pressure.'
                                                )
                                   )
                )
         FROM public.c77_dbh_mv_stats
-                 CROSS JOIN LATERAL (
-            -- Placeholder system stats; replace with real data later
-            SELECT 40 AS cpu_usage, 60 AS ram_usage, 80 AS io_rate
-            ) AS sys
         WHERE mv_name = p_mv_name
     );
 END;