diff --git a/src/frame_streams/audio_stream2.hpp b/src/frame_streams/audio_stream2.hpp
index 37e7230..1717358 100644
--- a/src/frame_streams/audio_stream2.hpp
+++ b/src/frame_streams/audio_stream2.hpp
@@ -35,5 +35,15 @@ struct AudioFrame2 {
 	}
 };
 
+template<>
+constexpr bool frameHasBytes<AudioFrame2>(void) {
+	return true;
+}
+
+template<>
+inline uint64_t frameGetBytes(const AudioFrame2& frame) {
+	return frame.getSpan().size * sizeof(int16_t);
+}
+
 using AudioFrame2Stream2I = FrameStream2I<AudioFrame2>;
 
diff --git a/src/frame_streams/frame_stream2.hpp b/src/frame_streams/frame_stream2.hpp
index 9a274e7..cb437e0 100644
--- a/src/frame_streams/frame_stream2.hpp
+++ b/src/frame_streams/frame_stream2.hpp
@@ -45,3 +45,21 @@ struct FrameStream2SinkI {
 	virtual bool unsubscribe(const std::shared_ptr<FrameStream2I<FrameType>>& sub) = 0;
 };
 
+// typed config
+// overload for your frame types
+
+template<typename FrameType>
+constexpr bool frameHasTimestamp(void) { return false; }
+
+template<typename FrameType>
+constexpr uint64_t frameGetTimestampDivision(void) = delete;
+
+template<typename FrameType>
+uint64_t frameGetTimestamp(const FrameType&) = delete;
+
+template<typename FrameType>
+constexpr bool frameHasBytes(void) { return false; }
+
+template<typename FrameType>
+uint64_t frameGetBytes(const FrameType&) = delete;
+
diff --git a/src/frame_streams/sdl/video.hpp b/src/frame_streams/sdl/video.hpp
index b2c1b11..f9b1851 100644
--- a/src/frame_streams/sdl/video.hpp
+++ b/src/frame_streams/sdl/video.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "../frame_stream2.hpp"
+
 #include <SDL3/SDL.h>
 
 #include <cstdint>
@@ -39,3 +41,47 @@ struct SDLVideoFrame {
 	SDLVideoFrame& operator=(const SDLVideoFrame& other) = delete;
 };
 
+template<>
+constexpr bool frameHasTimestamp<SDLVideoFrame>(void) {
+	return true;
+}
+
+template<>
+constexpr uint64_t frameGetTimestampDivision<SDLVideoFrame>(void) {
+	// microseconds
+	// technically sdl would provide them in nanoseconds... but we cut them down
+	return 1'000*1'000;
+}
+
+template<>
+inline uint64_t frameGetTimestamp(const SDLVideoFrame& frame) {
+	return frame.timestampUS;
+}
+
+template<>
+constexpr bool frameHasBytes<SDLVideoFrame>(void) {
+	return true;
+}
+
+// TODO: test how performant this call is
+template<>
+inline uint64_t frameGetBytes(const SDLVideoFrame& frame) {
+	if (!frame.surface) {
+		return 0;
+	}
+
+	const auto* surf = frame.surface.get();
+
+	if (surf->format == SDL_PIXELFORMAT_MJPG) {
+		// mjpg is special, since it is compressed
+		return surf->pitch;
+	}
+
+	const auto* details = SDL_GetPixelFormatDetails(surf->format);
+	if (details == nullptr) {
+		return 0;
+	}
+
+	return details->bytes_per_pixel * surf->w * surf->h;
+}
+
diff --git a/src/frame_streams/stream_manager.cpp b/src/frame_streams/stream_manager.cpp
index 1c4be13..2bf72d5 100644
--- a/src/frame_streams/stream_manager.cpp
+++ b/src/frame_streams/stream_manager.cpp
@@ -113,6 +113,8 @@ bool StreamManager::disconnectAll(Object o) {
 
 // do we need the time delta?
 float StreamManager::tick(float) {
+	float interval_min {2.01f};
+
 	// pump all mainthread connections
 	for (auto it = _connections.begin(); it != _connections.end();) {
 		auto& con = **it;
@@ -125,6 +127,10 @@ float StreamManager::tick(float) {
 
 		if (con.on_main_thread) {
 			con.pump_fn(con);
+			const float con_interval = con.interval_avg;
+			if (con_interval > 0.f) {
+				interval_min = std::min(interval_min, con_interval);
+			}
 		}
 
 		if (con.stop && (con.finished || con.on_main_thread)) {
@@ -139,8 +145,7 @@ float StreamManager::tick(float) {
 		}
 	}
 
-	// return min over intervals instead
-	return 2.f; // TODO: 2sec makes mainthread connections unusable
+	return interval_min;
 }
 
 bool StreamManager::onEvent(const ObjectStore::Events::ObjectConstruct& e) {
diff --git a/src/frame_streams/stream_manager.hpp b/src/frame_streams/stream_manager.hpp
index 7350036..5bb481f 100644
--- a/src/frame_streams/stream_manager.hpp
+++ b/src/frame_streams/stream_manager.hpp
@@ -2,6 +2,7 @@
 
 #include <solanaceae/object_store/fwd.hpp>
 #include <solanaceae/object_store/object_store.hpp>
+#include <solanaceae/util/time.hpp>
 
 #include <entt/core/type_info.hpp>
 
@@ -78,7 +79,16 @@ class StreamManager : protected ObjectStoreEventI {
 		std::thread pump_thread;
 
 		// frame interval counters and estimates
-		// TODO
+		std::atomic<float> interval_avg {0.f}; // s
+		std::atomic<uint64_t> frames_total{0};
+		std::atomic<uint64_t> bytes_total{0}; // if it can be mesured
+
+		// moving avg
+		std::atomic<float> bytes_per_sec{0};
+
+		// temps for mesuring
+		uint64_t _last_ts {0}; // frame format OR ms if frame has no ts
+
 
 		Connection(void) = default;
 		Connection(
@@ -193,19 +203,60 @@ bool StreamManager::connect(Object src, Object sink, bool threaded) {
 		h_src,
 		h_sink,
 		std::move(our_data),
-		[](Connection& con) -> void {
+		[](Connection& con) -> void { // pump
 			// there might be more stored
 			for (size_t i = 0; i < 64; i++) {
 				auto new_frame_opt = static_cast<inlineData*>(con.data.get())->reader->pop();
 				// TODO: frame interval estimates
 				if (new_frame_opt.has_value()) {
+					con.frames_total++;
+
+					// TODO: opt-in ?
+					float delta{0.f}; // s
+					uint64_t ts{0};
+					if constexpr (frameHasTimestamp<FrameType>()) {
+						ts = frameGetTimestamp(new_frame_opt.value());
+					} else {
+						ts = getTimeMS(); // fallback
+					}
+
+					if (con._last_ts != 0 && ts > con._last_ts) {
+						// normalize to seconds
+						if constexpr (frameHasTimestamp<FrameType>()) {
+							delta = float(ts - con._last_ts) / frameGetTimestampDivision<FrameType>();
+						} else {
+							delta = float(ts - con._last_ts) / 1000.f; // fallback
+						}
+
+						if (con.interval_avg == 0.f) {
+							con.interval_avg = delta;
+						} else {
+							con.interval_avg = con.interval_avg*0.95f + delta*0.05f;
+						}
+					}
+					con._last_ts = ts;
+
+					if constexpr (frameHasBytes<FrameType>()) {
+						// we need to always run this, timing stuff below might not
+						const auto bytes = frameGetBytes(new_frame_opt.value());
+						con.bytes_total += bytes;
+
+						if (delta > 0.f) {
+							if (con.bytes_per_sec == 0.f) {
+								con.bytes_per_sec = bytes/delta;
+							} else {
+								con.bytes_per_sec = con.bytes_per_sec*0.95f + (bytes/delta)*0.05f;
+							}
+						}
+					}
+
 					static_cast<inlineData*>(con.data.get())->writer->push(new_frame_opt.value());
 				} else {
 					break;
 				}
 			}
 		},
-		[](Connection& con) -> void {
+		[](Connection& con) -> void { // disco
 			auto* src_stream_ptr = con.src.try_get<Components::FrameStream2Source<FrameType>>();
 			if (src_stream_ptr != nullptr) {
 				(*src_stream_ptr)->unsubscribe(static_cast<inlineData*>(con.data.get())->reader);
diff --git a/src/stream_manager_ui.cpp b/src/stream_manager_ui.cpp
index 9ff55c2..de6c12e 100644
--- a/src/stream_manager_ui.cpp
+++ b/src/stream_manager_ui.cpp
@@ -2,9 +2,12 @@
 
 #include <solanaceae/object_store/object_store.hpp>
 
+#include "./string_formatter_utils.hpp"
+
 #include <imgui/imgui.h>
 
 #include <string>
+#include <cinttypes>
 
 StreamManagerUI::StreamManagerUI(ObjectStore2& os, StreamManager& sm) : _os(os), _sm(sm) {
 }
@@ -193,6 +196,7 @@ void StreamManagerUI::render(void) {
 					const auto& con = _sm._connections[i];
 					//ImGui::Text("con %d->%d", entt::to_integral(entt::to_entity(con->src.entity())), entt::to_integral(entt::to_entity(con->sink.entity())));
 
+					ImGui::BeginGroup(); // TODO: make group hover work
 					ImGui::PushID(i);
 
 					ImGui::TableNextColumn();
@@ -224,6 +228,27 @@ void StreamManagerUI::render(void) {
 					);
 
 					ImGui::PopID();
+					ImGui::EndGroup(); // TODO: make group hover work
+					if (ImGui::BeginItemTooltip()) {
+						uint64_t bytes_total = con->bytes_total;
+						float bytes_per_sec = con->bytes_per_sec;
+
+						const char* bytes_total_suffix = "???";
+						int64_t bytes_total_divider = sizeToHumanReadable(bytes_total, bytes_total_suffix);
+
+						const char* bytes_ps_suffix = "???";
+						int64_t bytes_ps_divider = sizeToHumanReadable(bytes_per_sec, bytes_ps_suffix);
+
+						ImGui::Text(
+							"interval: ~%.2fms (%.2ffps)\n"
+							"frames total: %" PRIu64 "\n"
+							"bytes total: %.2f%s (avg ~%.1f%s/s)",
+							con->interval_avg*1000.f, 1.f/con->interval_avg,
+							(uint64_t)con->frames_total,
+							bytes_total/float(bytes_total_divider), bytes_total_suffix, bytes_per_sec/bytes_ps_divider, bytes_ps_suffix
+						);
+						ImGui::EndTooltip();
+					}
 				}
 				ImGui::EndTable();
 			}
diff --git a/src/string_formatter_utils.hpp b/src/string_formatter_utils.hpp
index 22d8669..ef10c9b 100644
--- a/src/string_formatter_utils.hpp
+++ b/src/string_formatter_utils.hpp
@@ -5,7 +5,7 @@
 #include <array>
 
 // returns divider and places static suffix string into suffix_out
-static int64_t sizeToHumanReadable(int64_t file_size, const char*& suffix_out) {
+static inline int64_t sizeToHumanReadable(int64_t file_size, const char*& suffix_out) {
 	static const char* suffix_arr[] {
 		"Bytes",
 		"KiB",
@@ -27,7 +27,7 @@ static int64_t sizeToHumanReadable(int64_t file_size, const char*& suffix_out) {
 }
 
 // returns divider and places static suffix string into suffix_out
-static int64_t durationToHumanReadable(int64_t t, const char*& suffix_out) {
+static inline int64_t durationToHumanReadable(int64_t t, const char*& suffix_out) {
 	static const char* suffix_arr[] {
 		"ms",
 		"s",