feat: allow disabling parallel data-download per exchange

freqtrade/data/history/history_utils.py

@@ -388,10 +388,14 @@ def refresh_backtest_ohlcv_data(
             for timeframe in timeframes:
                 # Get fast candles via parallel method on first loop through per timeframe
                 # and candle type. Downloads all the pairs in the list and stores them.
-                if not no_parallel_download and (
-                    ((pair, timeframe, candle_type) not in fast_candles)
-                    and (erase is False)
-                    and (prepend is False)
+                if (
+                    not no_parallel_download
+                    and exchange.get_option("download_data_parallel_quick", True)
+                    and (
+                        ((pair, timeframe, candle_type) not in fast_candles)
+                        and (erase is False)
+                        and (prepend is False)
+                    )
                 ):
                     fast_candles.update(
                         _download_all_pairs_history_parallel(

freqtrade/exchange/exchange.py

@@ -137,6 +137,7 @@ class Exchange:
         "ohlcv_has_history": True,  # Some exchanges (Kraken) don't provide history via ohlcv
         "ohlcv_partial_candle": True,
         "ohlcv_require_since": False,
+        "download_data_parallel_quick": True,
         "always_require_api_keys": False,  # purge API keys for Dry-run. Must default to false.
         # Check https://github.com/ccxt/ccxt/issues/10767 for removal of ohlcv_volume_currency
         "ohlcv_volume_currency": "base",  # "base" or "quote"

freqtrade/exchange/exchange_types.py

@@ -25,6 +25,8 @@ class FtHas(TypedDict, total=False):
     ohlcv_volume_currency: str
     ohlcv_candle_limit_per_timeframe: dict[str, int]
     always_require_api_keys: bool
+    # allow disabling of parallel download-data for specific exchanges
+    download_data_parallel_quick: bool
     # Tickers
     tickers_have_quoteVolume: bool
     tickers_have_percentage: bool

freqtrade/exchange/hyperliquid.py

@@ -28,6 +28,7 @@ class Hyperliquid(Exchange):
         "stoploss_on_exchange": False,
         "exchange_has_overrides": {"fetchTrades": False},
         "marketOrderRequiresPrice": True,
+        "download_data_parallel_quick": False,
         "ws_enabled": True,
     }
     _ft_has_futures: FtHas = {