ok that makes it more clear. Thanks. Here is what is happening. you have portfolio getting data from dx. You have Level II/DOM getting data from Tradestation.
When you add symbol to portfolio, Level I data comes from there and you see the fast updates.
When you remove the symbol from portfolio, the currently "Active" source for the symbol is TradeStation (On Level II), so that is what the chart switches to and that is why you see the data slow down (TS Level I data is 1 sec updates).
this only comes up when multiple sources used at the same time. Do this... open another Level II window. Set it to dxFeed source, link it same color as those others, and just minimize it if you dont need it. Now Go to SETTINGS / DATA SOURCES / CONFIGURE ACCOUNTS. Select TradeStation. On the right side, set the Smart Source Priority to NEVER.
add symbol to portfolio then remove it now. Should work OK.
Right now without Level II window getting dx data, it goes to Tradestation since that is an active source. I will need to see if that can be changed.