diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index 465cce300..5f74d0e3f 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -2131,10 +2131,11 @@ class Exchange:
         except ccxt.BaseError as e:
             raise OperationalException(e) from e
 
-    @retrier
-    def get_market_leverage_tiers(self, symbol) -> List[Dict]:
+    @retrier_async
+    async def get_market_leverage_tiers(self, symbol: str) -> Tuple[str, List[Dict]]:
         try:
-            return self._api.fetch_market_leverage_tiers(symbol)
+            tier = await self._api_async.fetch_market_leverage_tiers(symbol)
+            return symbol, tier
         except ccxt.DDoSProtection as e:
             raise DDosProtection(e) from e
         except (ccxt.NetworkError, ccxt.ExchangeError) as e:
@@ -2168,8 +2169,14 @@ class Exchange:
                     f"Initializing leverage_tiers for {len(symbols)} markets. "
                     "This will take about a minute.")
 
-                for symbol in sorted(symbols):
-                    tiers[symbol] = self.get_market_leverage_tiers(symbol)
+                coros = [self.get_market_leverage_tiers(symbol) for symbol in sorted(symbols)]
+
+                for input_coro in chunks(coros, 100):
+
+                    results = self.loop.run_until_complete(
+                        asyncio.gather(*input_coro, return_exceptions=True))
+                    for symbol, res in results:
+                        tiers[symbol] = res
 
                 logger.info(f"Done initializing {len(symbols)} markets.")
 
diff --git a/tests/conftest.py b/tests/conftest.py
index b4b98cbeb..e9161d77e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -78,9 +78,21 @@ def get_args(args):
 
 
 # Source: https://stackoverflow.com/questions/29881236/how-to-mock-asyncio-coroutines
-def get_mock_coro(return_value):
+# TODO: This should be replaced with AsyncMock once support for python 3.7 is dropped.
+def get_mock_coro(return_value=None, side_effect=None):
     async def mock_coro(*args, **kwargs):
-        return return_value
+        if side_effect:
+            if isinstance(side_effect, list):
+                effect = side_effect.pop(0)
+            else:
+                effect = side_effect
+            if isinstance(effect, Exception):
+                raise effect
+            if callable(effect):
+                return effect(*args, **kwargs)
+            return effect
+        else:
+            return return_value
 
     return Mock(wraps=mock_coro)
 
diff --git a/tests/exchange/test_okx.py b/tests/exchange/test_okx.py
index 19c09ad9e..91c4a3368 100644
--- a/tests/exchange/test_okx.py
+++ b/tests/exchange/test_okx.py
@@ -6,7 +6,7 @@ import pytest
 from freqtrade.enums import MarginMode, TradingMode
 from freqtrade.enums.candletype import CandleType
 from freqtrade.exchange.exchange import timeframe_to_minutes
-from tests.conftest import get_patched_exchange
+from tests.conftest import get_mock_coro, get_patched_exchange
 from tests.exchange.test_exchange import ccxt_exceptionhandlers
 
 
@@ -273,7 +273,7 @@ def test_load_leverage_tiers_okx(default_conf, mocker, markets):
         'fetchLeverageTiers': False,
         'fetchMarketLeverageTiers': True,
     })
-    api_mock.fetch_market_leverage_tiers = MagicMock(side_effect=[
+    api_mock.fetch_market_leverage_tiers = get_mock_coro(side_effect=[
         [
             {
                 'tier': 1,