Customers notice a change in strategy performance results after some events in MultiCharts, for example when [[Backtesting vs Live Trading| comparing backtesting and live trading results]] or [[Why Identical Charts Are Showing Different Strategy Trading Results| comparing 2 charts ' strategy calculation results]]. The following events should be taken into consideration.
A strategy is '''recalculated''' ('''backtested''') when:
* Chart is [[Reloading Charts| '''reloaded''']],
* Chart is [[MultiCharts Work Area#Copying Windows| '''copy-pasted''']] (the strategy is '''recalculated on the copy''' of the original chart),
* Any signal script is [[Editing Study Scripts#Compiling Scripts| '''re-compiled''']] in the PowerLanguage Editor.
[[Category:FAQ]]