diff --git a/firmware/export/config/erosqnative.h b/firmware/export/config/erosqnative.h
index e326f29b98..f68830e211 100644
--- a/firmware/export/config/erosqnative.h
+++ b/firmware/export/config/erosqnative.h
@@ -106,7 +106,6 @@
 /* USB support */
 #ifndef SIMULATOR
 #define CONFIG_USBOTG USBOTG_DESIGNWARE
-#define USB_DW_ARCH_SLAVE
 #define USB_DW_TURNAROUND 5
 #define HAVE_USBSTACK
 #define USB_VENDOR_ID 0xc502
@@ -117,6 +116,10 @@
 #define HAVE_USB_CHARGING_IN_THREAD
 #define TARGET_USB_CHARGING_DEFAULT USB_CHARGING_FORCE
 #define HAVE_BOOTLOADER_USB_MODE
+/* This appears to improve transfer performance (the default is 64 KiB).
+ * Going any higher doesn't help but we're still slower than the OF. */
+#define USB_READ_BUFFER_SIZE    (128 * 1024)
+#define USB_WRITE_BUFFER_SIZE   (128 * 1024)
 #endif
 
 /* Rockbox capabilities */
diff --git a/firmware/export/config/fiiom3k.h b/firmware/export/config/fiiom3k.h
index 5a2fa6c025..29395bd433 100644
--- a/firmware/export/config/fiiom3k.h
+++ b/firmware/export/config/fiiom3k.h
@@ -106,7 +106,6 @@
 /* USB support */
 #ifndef SIMULATOR
 #define CONFIG_USBOTG USBOTG_DESIGNWARE
-#define USB_DW_ARCH_SLAVE
 #define USB_DW_TURNAROUND 5
 #define HAVE_USBSTACK
 #define USB_VENDOR_ID 0x2972
@@ -117,6 +116,10 @@
 #define HAVE_USB_CHARGING_IN_THREAD
 #define TARGET_USB_CHARGING_DEFAULT USB_CHARGING_FORCE
 #define HAVE_BOOTLOADER_USB_MODE
+/* This appears to improve transfer performance (the default is 64 KiB).
+ * Going any higher doesn't help but we're still slower than the OF. */
+#define USB_READ_BUFFER_SIZE    (128 * 1024)
+#define USB_WRITE_BUFFER_SIZE   (128 * 1024)
 #endif
 
 /* Rockbox capabilities */
diff --git a/firmware/export/config/shanlingq1.h b/firmware/export/config/shanlingq1.h
index c7ad1dfa6e..1f1ee79ca7 100644
--- a/firmware/export/config/shanlingq1.h
+++ b/firmware/export/config/shanlingq1.h
@@ -96,7 +96,6 @@
 /* USB support */
 #ifndef SIMULATOR
 #define CONFIG_USBOTG USBOTG_DESIGNWARE
-#define USB_DW_ARCH_SLAVE
 #define USB_DW_TURNAROUND 5
 #define HAVE_USBSTACK
 #define USB_VENDOR_ID 0x0525  /* Same as the xDuuo X3, for some reason. */
@@ -107,6 +106,10 @@
 #define HAVE_USB_CHARGING_IN_THREAD
 #define TARGET_USB_CHARGING_DEFAULT USB_CHARGING_FORCE
 #define HAVE_BOOTLOADER_USB_MODE
+/* This appears to improve transfer performance (the default is 64 KiB).
+ * Going any higher doesn't help but we're still slower than the OF. */
+#define USB_READ_BUFFER_SIZE    (128 * 1024)
+#define USB_WRITE_BUFFER_SIZE   (128 * 1024)
 #endif
 
 /* Rockbox capabilities */