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Feedback for QC... needs a lot of work...msg to Admin

Here are the issues I have with QC, in the order of how important they are to me.

1) The IDE is terribly slow. It takes up 100% of a core of my processor, and quickly gets slower and slower. After 10-15 minutes it slows to a crawl, as if it has a memory leak. Refreshing the IDE makes it go away, and then this process repeats itself. I'm using Firefox, and have the same issue on XP, Windows 8, and my Nexus cellphone.

2) The framework poorly manages memory. I constantly get "Runtime Error: Execution Security Error: Memory Usage Maxed Out - 1024MB max." It happens very randomly, but simply increasing the test period beyond 3-4 months almost always causes it. Having a large number of trades in a small time period also seems to cause it. This makes backtesting painful as I have to break it up into small time chunks. Sometimes I can re-run the exact same code and it doesn't happen the second time. This inconsistency really concerns me for when I move to live trading.

3) Backtesting is unacceptably slow. Before moving to QC, I would write my own backtests using entirely custom software in C. I would run it on my 10 year old dual core XP laptop. An example is a program that tested every single RSI value from 1 to 100, for 20 years of daily data, for 50 stocks, and I'd have the results in under 2 minutes. With QC it can take minutes to do just a few months of data for a single RSI value on a single stock. Combine this with issue #2 and it will take hours to do what should take minutes.

4) Only 4 days of warmup for an algorithm that uses second data is not enough. My algorithms can sometimes goes nuts until it has ~10 days worth of data. Even though it's a profitable algorithm, it won't work on QC for just this reason.

5) The profit graphs use a line to fit the daily closes of a stock. Any serious trader would, at minimum, use daily candles and more likely 15 minute candles. If my algorithm trades on the second time frame, a daily line chart is useless for debugging.

6) There is no available ask/bid data. This is a MUST for anyone who wants to write an HFT, trade the spread, or trade less liquid stocks.

7) Can't trade options. Also, options have huge spreads, so you'd need ask/bid data as a must for backtesting.

8) No matter how good or bad my algorithm is, it always says it's "better than 45% of the community". Possibly a bug?

Thanks. I really think QC has potential, so please keep up the good work.

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Thanks for the feedback John! We're working on all the issues you've mentioned :) The LEAN engine with a good CPU gets 100-500k events per second but on a shared-free community backtester it isn't quite as snappy. The position rating system is working well; there are just many great algorithms users have written.

Only caveat from your comments - LEAN isn't designed for HFT; spread or less liquid stock are fine if you have the quote data feel free to plug it into github.com/QuantConnect/Lean.

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Thanks...

If I upgrade to the paid service, would backtesting be significantly faster? It may be more profitable to invest in a faster free service - the sooner someone finds a profitable strategy, the sooner they become a paying customer. =)
 

I strongly recommend adding bid/ask data. It opens up a long list of spread trading strategies, and your main competitor doesn't have it, yet.

 

ps - fyi, for the last hour I'm getting a 502 Bad Gateway error when trying to use the Algorithm Lab

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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.


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