diff --git a/doc/json_schema.json b/doc/json_schema.json
index 01ef306de..5ae9bcc27 100644
--- a/doc/json_schema.json
+++ b/doc/json_schema.json
@@ -2655,8 +2655,8 @@
                                     },
                                     "waitTime": {
                                         "type": "integer",
-                                        "description": "Wait time (in ms). Disk I/O = (totalBytesEnd - totalBytesStart) / waitTime",
-                                        "default": 200,
+                                        "description": "Wait time (in ms) used to measure the I/O rate (calculated in bytes/sec).\nAvoid setting this too low, as the kernel requires time to accurately update counters.\nIgnored if 'detectTotal' is true.",
+                                        "default": 500,
                                         "minimum": 1
                                     },
                                     "key": {
@@ -3556,8 +3556,8 @@
                                     },
                                     "waitTime": {
                                         "type": "integer",
-                                        "description": "Wait time (in ms). Net I/O = (totalBytesEnd - totalBytesStart) / waitTime",
-                                        "default": 200,
+                                        "description": "Wait time (in ms) used to measure the I/O rate (calculated in bytes/sec).\nAvoid setting this too low, as the kernel requires time to accurately update counters.\nIgnored if 'detectTotal' is true.",
+                                        "default": 500,
                                         "minimum": 1
                                     },
                                     "key": {
diff --git a/src/modules/diskio/diskio.c b/src/modules/diskio/diskio.c
index 9acfbe511..87a18c54d 100644
--- a/src/modules/diskio/diskio.c
+++ b/src/modules/diskio/diskio.c
@@ -161,7 +161,7 @@ void ffInitDiskIOOptions(FFDiskIOOptions* options) {
 
     ffStrbufInit(&options->namePrefix);
     options->detectTotal = false;
-    options->waitTime = 1000;
+    options->waitTime = 500;
 }
 
 void ffDestroyDiskIOOptions(FFDiskIOOptions* options) {
diff --git a/src/modules/netio/netio.c b/src/modules/netio/netio.c
index e062a55c8..602368790 100644
--- a/src/modules/netio/netio.c
+++ b/src/modules/netio/netio.c
@@ -188,7 +188,7 @@ void ffInitNetIOOptions(FFNetIOOptions* options) {
 #endif
         ;
     options->detectTotal = false;
-    options->waitTime = 1000;
+    options->waitTime = 500;
 }
 
 void ffDestroyNetIOOptions(FFNetIOOptions* options) {