[Python] Why the python chess engine time goes downward Although the engine is running...

When i tried this code in my main project to get infinite analysis in my chess GUI (I wanted the engine to think infinitely about a position and give its data (score,best move,etc..) and no depth or time limit) , when I check time of analysis of engine ( which must be going up as it is running infinitely) ,it gives times up and down (like go from 5 sec to 3 sec and so on) so i tried it individually and still give me strange times as it goes on. How can I make the time go up only ( Make infinite analysis with engine ) , and for who is asking , I use threading so that I run the infinite analysis WITH the app (GUI) itself, as if if it used normally this line will be infinitely long and won't run rest of code
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import queue
import time
import chess.engine
import threading
import chess
board = chess.Board()
info_queue = queue.Queue()
engine = chess.engine.SimpleEngine.popen_uci("C:/Program Files/ChessX/data/engines/stockfish/stockfish-windows-x86-64.exe")
multipv_dict = []
def test():
global board
global info_queue
global multipv_dict
global engine
with engine.analysis(board, chess.engine.Limit(time=None), multipv=1) as analysis:
for info in analysis:
try:
if "multipv" in info and "pv" in info:
multipv_dict.append(info) # Save the info

# If we got all PVs we asked for
if len(multipv_dict) == 1:
# Clear old queue safely
with info_queue.mutex:
info_queue.queue.clear()

# Add all PVs
info_queue.put(multipv_dict)

multipv_dict = []
except chess.engine.EngineTerminatedError:break
while True:
tg = threading.Thread(target=test)
tg.start()
time.sleep(2) # Wait for the thread to start
if not info_queue.empty():
info_list = info_queue.get() # this is the [info_dict, ...]
# Since you requested multipv=1, you know info_list has exactly one item
info = info_list[0] # the InfoDict

# 2) Pull out the ‘time’ field
elapsed = info.get("time")
print(f"Engine thinking time: {elapsed:.3f} seconds")


Engine thinking time: 1.970 seconds
Engine thinking time: 1.532 seconds
Engine thinking time: 1.980 seconds
Engine thinking time: 1.861 seconds
Engine thinking time: 1.765 seconds
Engine thinking time: 1.866 seconds
Engine thinking time: 1.499 seconds
Engine thinking time: 0.742 seconds


and for who is wondering for analysis itself

[{'depth': 18, 'seldepth': 24, 'multipv': 1, 'score': PovScore(Cp(+28), WHITE), 'nodes': 278301, 'nps': 212281, 'hashfull': 108, 'tbhits': 0, 'time': 1.311, 'pv': [Move.from_uci('e2e4'), Move.from_uci('e7e5'), Move.from_uci('g1f3'), Move.from_uci('g8f6'), Move.from_uci('f3e5'), Move.from_uci('f6e4'), Move.from_uci('d2d4'), Move.from_uci('d7d5'), Move.from_uci('f1d3'), Move.from_uci('f8d6'), Move.from_uci('b1d2'), Move.from_uci('d8h4'), Move.from_uci('d1f3'), Move.from_uci('e4f6')]}]
[{'depth': 20, 'seldepth': 30, 'multipv': 1, 'score': PovScore(Cp(+26), WHITE), 'nodes': 252508, 'nps': 232940, 'hashfull': 81, 'tbhits': 0, 'time': 1.084, 'pv': [Move.from_uci('e2e4'), Move.from_uci('e7e5'), Move.from_uci('g1f3'), Move.from_uci('b8c6'), Move.from_uci('d2d4'), Move.from_uci('e5d4'), Move.from_uci('f3d4'), Move.from_uci('g8f6'), Move.from_uci('d4c6'), Move.from_uci('b7c6'), Move.from_uci('f1d3'), Move.from_uci('d7d5'), Move.from_uci('e4e5'), Move.from_uci('f6d7'), Move.from_uci('e1g1'), Move.from_uci('d7c5'), Move.from_uci('f2f4'), Move.from_uci('c5d3'), Move.from_uci('c2d3'), Move.from_uci('c8f5'), Move.from_uci('g2g4'), Move.from_uci('f5c8'), Move.from_uci('f4f5'), Move.from_uci('d8h4')]}]
[{'depth': 24, 'seldepth': 27, 'multipv': 1, 'score': PovScore(Cp(+28), WHITE), 'nodes': 443589, 'nps': 249067, 'hashfull': 164, 'tbhits': 0, 'time': 1.781, 'pv': [Move.from_uci('e2e4'), Move.from_uci('e7e5'), Move.from_uci('g1f3'), Move.from_uci('b8c6'), Move.from_uci('f1b5'), Move.from_uci('a7a6'), Move.from_uci('b5a4'), Move.from_uci('g8f6'), Move.from_uci('e1g1'), Move.from_uci('f6e4'), Move.from_uci('d2d4'), Move.from_uci('b7b5'), Move.from_uci('a4b3'), Move.from_uci('d7d5'), Move.from_uci('d4e5'), Move.from_uci('c8e6'), Move.from_uci('c2c3'), Move.from_uci('f8c5'), Move.from_uci('b1d2'), Move.from_uci('e8g8'), Move.from_uci('b3c2'), Move.from_uci('f7f5'), Move.from_uci('e5f6'), Move.from_uci('e4f6'), Move.from_uci('d2b3'), Move.from_uci('c5b6')]}]
[{'depth': 22, 'seldepth': 32, 'multipv': 1, 'score': PovScore(Cp(+34), WHITE), 'nodes': 526291, 'nps': 270031, 'hashfull': 198, 'tbhits': 0, 'time': 1.949, 'pv': [Move.from_uci('e2e4'), Move.from_uci('e7e5'), Move.from_uci('g1f3'), Move.from_uci('b8c6'), Move.from_uci('f1b5'), Move.from_uci('a7a6'), Move.from_uci('b5a4'), Move.from_uci('g8f6'), Move.from_uci('e1g1'), Move.from_uci('b7b5'), Move.from_uci('a4b3'), Move.from_uci('f6e4'), Move.from_uci('d2d4'), Move.from_uci('d7d5'), Move.from_uci('d4e5'), Move.from_uci('c8e6'), Move.from_uci('c2c3'), Move.from_uci('f8e7'), Move.from_uci('b1d2'), Move.from_uci('e4c5'), Move.from_uci('b3c2'), Move.from_uci('d5d4'), Move.from_uci('d2b3'), Move.from_uci('c5b3'), Move.from_uci('a2b3'), Move.from_uci('d4c3')]}]
[{'depth': 20, 'seldepth': 30, 'multipv': 1, 'score': PovScore(Cp(+19), WHITE), 'nodes': 456265, 'nps': 271748, 'hashfull': 167, 'tbhits': 0, 'time': 1.679, 'pv': [Move.from_uci('e2e4'), Move.from_uci('e7e5'), Move.from_uci('g1f3'), Move.from_uci('b8c6'), Move.from_uci('f1b5'), Move.from_uci('g8f6'), Move.from_uci('d2d4'), Move.from_uci('e5d4'), Move.from_uci('e1g1'), Move.from_uci('a7a6'), Move.from_uci('b5a4'), Move.from_uci('f8e7'), Move.from_uci('f1e1'), Move.from_uci('e8g8'), Move.from_uci('e4e5'), Move.from_uci('f6e8'), Move.from_uci('h2h3'), Move.from_uci('d7d6'), Move.from_uci('a4c6'), Move.from_uci('b7c6'), Move.from_uci('f3d4'), Move.from_uci('d8d7'), Move.from_uci('e5d6'), Move.from_uci('e7d6')]}]
[{'depth': 24, 'seldepth': 36, 'multipv': 1, 'score': PovScore(Cp(+31), WHITE), 'nodes': 427789, 'nps': 303181, 'hashfull': 154, 'tbhits': 0, 'time': 1.411, 'pv': [Move.from_uci('e2e4'), Move.from_uci('e7e5'), Move.from_uci('g1f3'), Move.from_uci('b8c6'), Move.from_uci('f1b5'), Move.from_uci('g8f6'), Move.from_uci('e1g1'), Move.from_uci('f6e4'), Move.from_uci('f1e1'), Move.from_uci('e4d6'), Move.from_uci('f3e5'), Move.from_uci('f8e7'), Move.from_uci('b5f1'), Move.from_uci('c6e5'), Move.from_uci('e1e5'), Move.from_uci('e8g8'), Move.from_uci('d2d4'), Move.from_uci('e7f6'), Move.from_uci('e5e1'), Move.from_uci('f8e8'), Move.from_uci('c1f4'), Move.from_uci('e8e1'), Move.from_uci('d1e1'), Move.from_uci('f6d4')]}]
[{'depth': 25, 'seldepth': 35, 'multipv': 1, 'score': PovScore(Cp(+27), WHITE), 'nodes': 371424, 'nps': 275946, 'hashfull': 154, 'tbhits': 0, 'time': 1.346, 'pv': [Move.from_uci('e2e4'), Move.from_uci('e7e5'), Move.from_uci('g1f3'), Move.from_uci('b8c6'), Move.from_uci('f1b5'), Move.from_uci('g8f6'), Move.from_uci('e1g1'), Move.from_uci('f6e4'), Move.from_uci('f1e1'), Move.from_uci('e4d6'), Move.from_uci('f3e5'), Move.from_uci('f8e7'), Move.from_uci('b5f1'), Move.from_uci('c6e5'), Move.from_uci('e1e5'), Move.from_uci('e8g8'), Move.from_uci('d2d4'), Move.from_uci('d6e8'), Move.from_uci('d4d5'), Move.from_uci('e7c5'), Move.from_uci('e5e1'), Move.from_uci('d7d6'), Move.from_uci('b1c3'), Move.from_uci('f7f5'), Move.from_uci('c1e3'), Move.from_uci('c5e3'), Move.from_uci('e1e3'), Move.from_uci('e8f6'), Move.from_uci('e3e2'), Move.from_uci('c8d7'), Move.from_uci('a2a4'), Move.from_uci('f8e8'), Move.from_uci('a4a5')]}]


I THINK THIS IS CAUSED BY DIFFERENCE BETWEEN analysis and analyse ,COULD ANYONE HELP ME AND EXPLAIN DIFF BETWEEN THESE two

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