@Derek, If the code is slow and can't process a call of handle_data within ~50 seconds, you will receive a timeout error and the algorithm will stop trading. This is true for both backtesting and live trading. The algorithm will stop to prevent falling behind the market feed.
@Ashish, the 200 security cap exists for both minutely and daily mode backtests. The one possible work-around is you use 10% of a universe using set_universe in daily mode, which is roughly 800 stocks. The one caveat is you can't use this setting for live trading with IB because you're required to run a minute-mode full backtest to simulate the live trading experience. Perhaps you'd like to use this route to test your strategy, and then can reduce the universe size and convert to minute mode backtesting.
If you're developing in daily mode, remember that you're only sampling data once per day, at the last bar. This means that your data has more variation because there can be large price differences at the end of day, depending on the stock.
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