diff --git a/hubble-sync/src/host/mod.rs b/hubble-sync/src/host/mod.rs
index d27de9b..2191623 100644
--- a/hubble-sync/src/host/mod.rs
+++ b/hubble-sync/src/host/mod.rs
@@ -63,7 +63,7 @@ const DEFAULT_RELAY_HOST_QPS: NonZeroU32 = NonZeroU32::new(1000).unwrap();
 
 const DEFAULT_HOST_CONCURRENCY: usize = 2; // TODO: config / policy-based; be kind to hosts for now
 const DEFAULT_BSKY_HOST_CONCURRENCY: usize = 10; // TODO: config / policy-based; be kind to hosts for now
-const DEFAULT_RELAY_HOST_CONCURRENCY: usize = 32;
+const DEFAULT_RELAY_HOST_CONCURRENCY: usize = 256;
 
 const DEFAULT_MAX_REDIRECTS: usize = 10;
 const DEFAULT_MAX_NON_STREAM_BODY: usize = 10 * 2_usize.pow(20); // 10MiB