How to check TWS memory allocation

Quick answer

TWS memory allocation is under Global Configuration → General. Increase it only when the workload and available computer memory justify the change. An excessively large allocation can also cause problems, so record the starting value.

Educational software guidance. Trading involves risk. Read the financial and information disclaimers.

Step by step

1 Open Global Configuration → General and locate Memory Allocation in MB.
2 Record the current value and the computer’s available memory.
3 If support or measured workload calls for a change, choose a value that leaves memory for the operating system and other apps.
4 Apply the intended change and restart TWS during a planned pause; the setting is marked as requiring restart.
5 Repeat the same chart or window task and compare responsiveness and memory use.

A practical example

Suppose a computer has several large apps open and TWS becomes slow. Giving TWS most of the machine’s RAM can leave too little for the rest. First write down the old value. Then compare the same small task before and after one planned change. For example, time how long the same watchlist takes to open. Also note whether other apps get slower. You want a stable whole machine, not a large number in one box. If the quote feed itself is late, more local RAM will not bring the price to you sooner.

Illustrative scenario, not a record of a trade placed during this review.

Screen reference

Start in Mosaic with File → Global Configuration. Then choose the panel named in the steps.

TWS General settings with Memory Allocation in MB — Memory Allocation appears in General. A star marks settings that require a restart. Captured in TWS paper mode on 3 October 2026. Open the image for full size.

How to confirm the result The same workload should run reliably without starving the rest of the computer of memory.

Mistake to avoid

Do not copy a large RAM value from Reddit as a universal fix. Slow data, overloaded layouts, and network issues have different causes.

Common questions

Does more memory always make TWS faster?

No. Allocation must fit the machine and workload.

Does the change work at once?

The General panel marks this setting as requiring a restart.

Find Global Configuration in Mosaic and Classic TWS TWS is slow or freezing: a practical diagnosis Where to configure TWS Auto restart

Financial and information disclaimers

Financial disclaimer

These guides explain software. They are for education, not financial, investment, tax, or legal advice. No example is a suggestion to buy or sell a product or use a trading strategy. Trading can lose money, including all funds you put at risk. With margin, futures, short sales, or some options, losses can exceed your starting funds. Automation can fail, send duplicate orders, or act late. Stops do not guarantee a fill or a price. Review your orders and positions, and seek advice from a qualified professional for your own needs. Paper trades, examples, and past results do not predict live results or promise a profit.

Information disclaimer

This is general help based on the sources and check date shown on the page. Screens, settings, fees, data access, and product support can change or differ by app version, account, country, and broker. The content may contain errors or become out of date; accuracy, completeness, and continuous service are not guaranteed. Check current broker and app instructions before acting. Screenshots show where controls are; they do not prove that an order test passed. This guide does not replace broker terms or risk notices. References to IBKR and TradingView identify their products and do not imply their endorsement of this guide.