diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index bfacece..ca4c1d7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -75,6 +75,7 @@ jobs:
             - source-path: ./
             - name: ArxContainer
             - name: ArxTypeTraits
+            - name: PollingTimer
             - name: WiFi
             - name: FastLED
           verbose: true
@@ -122,6 +123,7 @@ jobs:
             - source-path: ./
             - name: ArxContainer
             - name: ArxTypeTraits
+            - name: PollingTimer
             - name: WiFiNINA
             - name: VidorPeripherals
             - name: FastLED
@@ -161,6 +163,7 @@ jobs:
             - source-path: ./
             - name: ArxContainer
             - name: ArxTypeTraits
+            - name: PollingTimer
           verbose: true
 
   build-ethernet:
@@ -251,6 +254,7 @@ jobs:
             - source-path: ./
             - name: ArxContainer
             - name: ArxTypeTraits
+            - name: PollingTimer
             - name: Ethernet
             - name: FastLED
           verbose: true
@@ -295,6 +299,7 @@ jobs:
             - source-path: ./
             - name: ArxContainer
             - name: ArxTypeTraits
+            - name: PollingTimer
             - name: FastLED
           verbose: true
 
@@ -382,6 +387,7 @@ jobs:
             - source-path: ./
             - name: ArxContainer
             - name: ArxTypeTraits
+            - name: PollingTimer
             - name: FastLED
             - source-url: https://github.com/JAndrassy/EthernetENC.git
           verbose: true
@@ -431,6 +437,7 @@ jobs:
             - source-path: ./
             - name: ArxContainer
             - name: ArxTypeTraits
+            - name: PollingTimer
             - name: WiFi
             - name: Ethernet
           verbose: true
diff --git a/Artnet/ArtDmx.h b/Artnet/ArtDmx.h
index 57b1403..c96483a 100644
--- a/Artnet/ArtDmx.h
+++ b/Artnet/ArtDmx.h
@@ -38,7 +38,7 @@ using CallbackType = std::function<void(const uint8_t *data, uint16_t size, cons
 #if ARX_HAVE_LIBSTDCPLUSPLUS >= 201103L  // Have libstdc++11
 using CallbackMap = std::map<uint16_t, CallbackType>;
 #else
-using CallbackMap = arx::stdx::map<uint16_t, CallbackType>;
+using CallbackMap = arx::stdx::map<uint16_t, CallbackType, FIXED_CONTAINER_CAPACITY>;
 #endif
 
 inline Metadata generateMetadataFrom(const uint8_t *packet)
diff --git a/Artnet/ArtNzs.h b/Artnet/ArtNzs.h
index 6c52367..b0447fd 100644
--- a/Artnet/ArtNzs.h
+++ b/Artnet/ArtNzs.h
@@ -38,7 +38,7 @@ using CallbackType = std::function<void(const uint8_t *data, uint16_t size, cons
 #if ARX_HAVE_LIBSTDCPLUSPLUS >= 201103L  // Have libstdc++11
 using CallbackMap = std::map<uint16_t, CallbackType>;
 #else
-using CallbackMap = arx::stdx::map<uint16_t, CallbackType>;
+using CallbackMap = arx::stdx::map<uint16_t, CallbackType, FIXED_CONTAINER_CAPACITY>;
 #endif
 
 inline Metadata generateMetadataFrom(const uint8_t *packet)
diff --git a/Artnet/Common.h b/Artnet/Common.h
index db0f414..743e6ea 100644
--- a/Artnet/Common.h
+++ b/Artnet/Common.h
@@ -57,7 +57,7 @@ constexpr uint16_t PROTOCOL_VER {14}; // 0x000E
 constexpr uint8_t ID_LENGTH {8};
 constexpr char ARTNET_ID[ID_LENGTH] {"Art-Net"};
 constexpr float DEFAULT_FPS {40.};
-constexpr uint32_t DEFAULT_INTERVAL_MS {(uint32_t)(1000. / DEFAULT_FPS)};
+constexpr double DEFAULT_INTERVAL_MS {1000. / (double)DEFAULT_FPS};
 
 // ArtDmx, ArtTrigger has same structure
 constexpr uint16_t HEADER_SIZE {18};
@@ -67,6 +67,7 @@ constexpr uint16_t PACKET_SIZE {530};
 template <uint16_t SIZE, typename T = uint8_t>
 using Array = std::array<T, SIZE>;
 #else
+constexpr size_t FIXED_CONTAINER_CAPACITY = 3;
 template <uint16_t SIZE, typename T = uint8_t>
 using Array = arx::stdx::vector<T, SIZE>;
 #endif
@@ -122,12 +123,12 @@ inline bool operator==(const Destination &rhs, const Destination &lhs)
 
 #if ARX_HAVE_LIBSTDCPLUSPLUS >= 201103L  // Have libstdc++11
 // sender
-using LastSendTimeMsMap = std::map<Destination, uint32_t>;
+using LastSendTimeMsMap = std::map<Destination, double>;
 using SequenceMap = std::map<Destination, uint8_t>;
 #else
 // sender
-using LastSendTimeMsMap = arx::stdx::map<Destination, uint32_t>;
-using SequenceMap = arx::stdx::map<Destination, uint8_t>;
+using LastSendTimeMsMap = arx::stdx::map<Destination, double, FIXED_CONTAINER_CAPACITY>;
+using SequenceMap = arx::stdx::map<Destination, uint8_t, FIXED_CONTAINER_CAPACITY>;
 #endif
 
 }  // namespace art_net
diff --git a/Artnet/Sender.h b/Artnet/Sender.h
index f198a7e..d3c7bb5 100644
--- a/Artnet/Sender.h
+++ b/Artnet/Sender.h
@@ -8,6 +8,7 @@
 #include "ArtTrigger.h"
 #include "ArtSync.h"
 #include "SenderTraits.h"
+#include <PollingTimer.h>
 
 namespace art_net {
 
@@ -20,6 +21,7 @@ class Sender_
 {
     S* stream;
     Array<PACKET_SIZE> packet;
+    PollingTimer timer;
     LastSendTimeMsMap last_send_times;
     SequenceMap dmx_sequences;
     SequenceMap nzs_sequences;
@@ -30,6 +32,7 @@ class Sender_
     Sender_()
     {
         this->packet.resize(PACKET_SIZE);
+        this->timer.start();
     }
 #endif
 
@@ -57,9 +60,9 @@ class Sender_
     void streamArtDmxTo(const String& ip, uint8_t net, uint8_t subnet, uint8_t universe, uint8_t physical)
     {
         Destination dest {ip, net, subnet, universe};
-        uint32_t now = millis();
+        double now = timer.msec();
         if (this->last_send_times.find(dest) == this->last_send_times.end()) {
-            this->last_send_times.insert(std::make_pair(dest, uint32_t(0)));
+            this->last_send_times.insert(std::make_pair(dest, 0.0));
         }
         if (now >= this->last_send_times[dest] + DEFAULT_INTERVAL_MS) {
             this->sendArxDmxInternal(dest, physical);
@@ -91,9 +94,9 @@ class Sender_
     void streamArtNzsTo(const String& ip, uint8_t net, uint8_t subnet, uint8_t universe, uint8_t start_code)
     {
         Destination dest {ip, net, subnet, universe};
-        uint32_t now = millis();
+        double now = timer.msec();
         if (this->last_send_times.find(dest) == this->last_send_times.end()) {
-            this->last_send_times.insert(std::make_pair(dest, uint32_t(0)));
+            this->last_send_times.insert(std::make_pair(dest, 0.0));
         }
         if (now >= this->last_send_times[dest] + DEFAULT_INTERVAL_MS) {
             this->sendArxNzsInternal(dest, start_code);
diff --git a/README.md b/README.md
index 223d66f..d2d1a8e 100644
--- a/README.md
+++ b/README.md
@@ -400,6 +400,8 @@ void setLogger(Print*);
 
 Some boards without enough memory (e.g. Uno, Nano, etc.) may not be able to use integrated sender/receiver because of the lack of enough memory. Please consider to use more powerful board or to use only sender OR receiver.
 
+In addition, those boards have limitation of the number of callbacks and destinations (see `FIXED_CONTAINER_CAPACITY`) because of the lack of memory. Please consider to reduce the number of callbacks/destinations or to use more powerful board.
+
 ## Reference
 
 - [Spec (Art-Net 4)](http://artisticlicence.com/WebSiteMaster/User%20Guides/art-net.pdf)
diff --git a/library.json b/library.json
index 8fbcf1d..670f91b 100644
--- a/library.json
+++ b/library.json
@@ -17,6 +17,7 @@
 	"platforms": "*",
 	"dependencies": {
 		"hideakitai/ArxContainer": ">=0.6.0",
-		"hideakitai/ArxTypeTraits": ">=0.3.2"
+		"hideakitai/ArxTypeTraits": ">=0.3.2",
+		"hideakitai/PollingTimer": "*"
 	}
 }
diff --git a/library.properties b/library.properties
index 8c3b95a..f39e746 100644
--- a/library.properties
+++ b/library.properties
@@ -7,4 +7,4 @@ paragraph=Art-Net Sender/Receiver for Arduino (Ethernet, WiFi)
 category=Communication
 url=https://github.com/hideakitai/ArtNet
 architectures=*
-depends=ArxContainer (>=0.6.0), ArxTypeTraits (>=0.3.2)
+depends=ArxContainer (>=0.6.0), ArxTypeTraits (>=0.3.2), PollingTimer